Chapter 1
Could You Have an Undiagnosed Thyroid Condition?
Knowledge is of two kinds: we know a subject ourselves, or we know where we can find information about it.
—SAMUEL JOHNSON
The thyroid is a small butterfly-shaped gland located in your neck around the windpipe, behind and below your Adam’s apple area. The thyroid produces several hormones, but two are absolutely essential: triiodothyronine (T3) and thyroxine (T4). These hormones help oxygen get into your cells and are critical to your body’s ability to produce energy. This role in delivering oxygen and energy makes your thyroid the master gland of metabolism.
The thyroid has the only cells in the body capable of absorbing iodine. It takes in the iodine obtained through food, iodized salt, or supplements, and combines that iodine with the amino acid tyrosine. The thyroid then converts the iodine/tyrosine combination into the hormones T3 and T4. The 3 and the 4 refer to the number of iodine atoms in each thyroid hormone molecule.
Of all the hormones produced by your thyroid when it is functioning properly, approximately 80 percent will be T4 and 20 percent will be T3. Of the two, T4 is a storage hormone, and T3 is the biologically active hormone—the one that actually has an effect at the cellular level. So while the thyroid gland produces some T3, the rest of the T3 needed by the body is actually formed when the body converts stored T4 to T3. Once released by the thyroid, the T3 and T4 travel through the bloodstream. When it reaches cells, thyroid hormone helps convert oxygen and calories into energy to serve as the basic fuel for your metabolism.
As mentioned, the thyroid produces some T3. But the rest of the T3 needed by the body is actually formed by the conversion of the mostly inactive storage hormone T4. The process by which T4 becomes T3 is sometimes referred to as T4-to-T3 conversion. This conversion can take place in the thyroid, the liver, the brain, and other organs and tissues.
As T3 circulates through your bloodstream, it attaches to and enters your cells via receptor sites on the membrane of the cells. Once inside the cells, T3 increases cell metabolic rate, including body temperature, and stimulates the cells to produce a number of different hormones, enzymes, neurotransmitters, and muscle tissue. T3 also helps your cells use oxygen and release carbon dioxide, which assists metabolic function.
So how does the thyroid know how much T4 and T3 to produce? The release of hormones from the thyroid is part of a feedback process. The hypothalamus, a part of the brain, releases thyrotropin-releasing hormone (TRH). The release of TRH tells your pituitary gland to in turn produce thyroid-stimulating hormone (TSH). The TSH that circulates in your bloodstream is the messenger that tells your thyroid to make the thyroid hormones T4 and T3, sending them into your bloodstream. When the pituitary senses a sufficient amount of thyroid hormone circulating in the bloodstream, the pituitary makes less TSH. This reduction in TSH is a signal to the thyroid that it can slow down thyroid hormone production. When the pituitary senses that there is not enough thyroid hormone circulating, TSH goes up.
It’s a smoothly functioning system when it works properly. But when the thyroid gland itself malfunctions, or when something interferes with the system and the feedback process doesn’t work, thyroid symptoms develop.
PREVALENCE
At minimum, experts estimate, there are 27 million thyroid sufferers in the United States, and at least 13 million of them are undiagnosed. There are some scientists who suggest that the actual number is much higher, maybe as high as 59 million, which would mean that about one in five Americans has a thyroid problems. In the United States, the most prevalent thyroid disease is Hashimoto’s disease, an autoimmune condition that causes hypothyroidism—an underactive thyroid. Thyroid problems are actually the most common autoimmune diseases in America today.
Women are seven to ten times more likely than men to develop thyroid problems. During their lifetime, women face as much as a one in five chance of developing a thyroid problem. For both men and women, the risk of thyroid disease increases with age, and by age seventy, the prevalence of subclinical hypothyroidism in men is nearly as high as in women.
In the United States, thyroid cancer is on the rise, with an estimated 45,000 new cases diagnosed in 2010. The incidence of thyroid cancer has increased substantially in the past decade, and experts believe it’s in part due to exposure to radiation.
Thyroid problems are also common in many other countries, and autoimmune thyroid disease and thyroid cancer in particular are more prevalent in the areas around and downwind of the 1986 Chernobyl nuclear accident. Other areas that have a higher incidence of thyroid problems are those parts of the world that were at one time covered by glaciers, where iodine is not present in the soil and in foods. In many of these countries, an enlarged thyroid, known as goiter, is seen in as many as one in five people and is usually due to iodine deficiency. Globally, an estimated 8 percent of the population has goiter, most commonly women. Iodine deficiency during pregnancy is also the leading preventable cause of mental retardation around the world.
OVERVIEW OF CONDITIONS
The main conditions that can occur with the thyroid include:
• Hypothyroidism: when the thyroid is underactive and isn’t producing sufficient thyroid hormone
• Hyperthyroidism: when the thyroid is overactive and is producing too much thyroid hormone
• Goiter: when the thyroid becomes enlarged, due to hypothyroidism or hyperthyroidism
• Nodules: when lumps, usually benign, grow in the thyroid, sometimes causing it to become hypothyroid or hyperthyroid
• Thyroid cancer: when lumps or nodules in the thyroid are malignant
• Postpartum thyroiditis: when the thyroid is temporarily inflamed, in addition to hypothyroidism or hyperthyroidism triggered after pregnancy
• Transient thyroiditis: temporary inflammation or infection of the thyroid that can cause hypothyroid or hyperthyroid symptoms in some people
Causes and Risk Factors
The most common causes of thyroid conditions are autoimmune diseases, notably Hashimoto’s thyroiditis and Graves’ disease. In an autoimmune disease, the body’s immune defenses inappropriately identify the thyroid as foreign to the body in some way. Hashimoto’s disease may cause periods of hyperthyroidism, followed by permanent hypothyroidism as the antibodies produced by the immune system destroy the gland’s ability to produce thyroid hormone. In Graves’ disease, antibodies cause the thyroid to produce excessive amounts of thyroid hormone, a condition that is called hyperthyroidism and which can become life-threatening if not treated. If you have Graves’ disease, you’ll most likely receive antithyroid drugs, radioactive iodine, or surgery that will partially or entirely disable the thyroid’s ability to produce thyroid hormone. Most people will become hypothyroid after treatment for Graves’ disease.
The risk of developing thyroid disease is greatest if:
• You or a family member has a history of thyroid problems
• You or a family member has a history of autoimmune disease (e.g., rheumatoid arthritis, psoriasis, vitiligo, multiple sclerosis, lupus, or other conditions)
• You are or were a smoker
• You have had a stomach infection or food poisoning in the past, especially if the infection is diagnosed as being caused by the food-borne bacterium Yersinia enterocolitica
• You have allergies or a sensitivity to gluten, or have been diagnosed with celiac disease
• You’ve been exposed to radiation, by living near or downwind from a nuclear plant, or through particular medical treatments (e.g., treatment for Hodgkin’s disease, nasal radium therapy, radiation to tonsils and neck area), have had numerous dental or neck X-rays (without a thyroid collar), or were near or downwind of the Chernobyl nuclear disaster in 1986
• You’ve been treated with the medications lithium or amiodarone
• You have been taking supplemental iodine, kelp, bladder wrack, or bugleweed
• You live in an area (e.g., the midwestern “goiter belt”) where there is low iodine in the soil, or you have cut down substantially on the iodized salt in your diet, leaving you iodine-deficient
• You’ve been exposed to excessive amounts of environmental estrogens, toxins, and other chemicals (e.g., perchlorate, fluoride, bisphenol A) via your water, food, or employment
• You’ve been excessively exposed to metals such as mercury
• You drink fluoridated water and use external fluoride (fluoridated toothpaste, fluoride treatments)
• You are a heavy consumer of soy products, especially soy powders or soy-based supplements
• You eat a substantial quantity of raw goitrogenic foods such as Brussels sprouts, rutabaga, turnips, kohlrabi, radishes, cauliflower, cassava, millet, cabbage, kale, and babassu (fruits from a type of palm tree native to the Amazon)
• You are over age sixty
• You are female
• You are in a period of hormonal variance such as perimenopause, menopause, pregnancy, or postpartum
• You have had serious trauma to the neck such as whiplash from a car accident or a broken neck
• You currently have or have in the past been diagnosed with any of the following diseases or conditions, known to occur more frequently in people with thyroid disease:
• Other pituitary or endocrine disease (e.g., diabetes, a pituitary tumor, polycystic ovary syndrome [PCOS], endometriosis, premature menopause, adrenal disease)
• Chronic fatigue syndrome
• Fibromyalgia
• Carpal tunnel syndrome, tendonitis, plantar fasciitis
• Mitral valve prolapse syndrome (MVPS)
• Epstein-Barr virus (EBV)
• Mononucleosis
• Depression
• Infertility or recurrent miscarriage
• Celiac disease (gluten intolerance)
HYPOTHYROIDISM
The most common thyroid condition is hypothyroidism. It’s estimated that the majority of people with thyroid conditions in the United States are hypothyroid. A concerning statistic: most experts believe that at least half of Americans with a thyroid disorder are undiagnosed.
If you have hypothyroidism, your thyroid fails to produce sufficient levels of the thyroid hormones needed by your body. This slows down a variety of bodily functions, as well as your metabolism. Hypothyroidism typically develops when:
• An autoimmune disease (Hashimoto’s disease) has caused your immune system to attack and destroy your thyroid, making it unable to produce sufficient hormone amounts.
• You’ve had radioactive iodine (RAI) treatment for your overactive thyroid, which has made all or part of your thyroid unable to produce hormone.
• You have a goiter or thyroid nodule(s) that is interfering with your gland’s ability to produce hormone.
• You’ve had surgery for goiter, thyroid nodules, Hashimoto’s disease, or thyroid cancer, and all or part of your thyroid has been removed.
• You’ve been hypothyroid since birth. A small percentage of people experience this condition, known as congenital hypothyroidism, which results from a missing or malformed thyroid gland.
• You have an imbalance in your adrenal or reproductive hormones that is putting strain on the thyroid’s ability to produce hormone.
• You have a significant excess or deficiency of iodine that is affecting the thyroid’s ability to function properly.
• You are taking a medication, such as lithium, that is disabling the thyroid’s ability to produce sufficient hormone.
• You are hyperthyroid and taking too much antithyroid medication.
Ultimately, however your thyroid problem started, if your thyroid is now unable to produce sufficient thyroid hormone, or if you don’t have a thyroid at all, you are considered hypothyroid.
Symptoms
You may be hypothyroid if:
• You are extremely exhausted and fatigued
• You feel depressed, moody, or sad
• You’re sensitive to cold, and you have cold hands or feet
• You’re experiencing inappropriate weight gain, or having difficulty losing weight, despite changes in diet and exercise
• Your hair has become dry, easily tangled, or coarse
• You’ve lost hair, and in particular, hair from the outer part of the eyebrows
• You have dry or brittle nails
• You’re feeling muscle and joint pains and aches
• You have carpal tunnel syndrome or tendonitis in the arms and legs
• The soles of your feet are painful, a condition known as plantar fasciitis
• Your face, eyes, arms, or legs are abnormally swollen or puffy
• You have an unusually low sex drive
• You have unexplained infertility, or recurrent miscarriages with no obvious explanation
• Your menstrual period is heavier than normal, or your period is longer than it used to be or comes more frequently
• You feel like your thinking is fuzzy (e.g., you have difficulty concentrating or remembering)
• You’re constipated
• You have a full or sensitive feeling in the neck
• Your voice is raspy or hoarse
• Your heart rate or blood pressure is unusually low
• You have periodic heart palpitations
• Your total cholesterol and LDL (“bad”) cholesterol levels are high and may not respond to diet and medication
• Your allergies have gotten worse, and you experience symptoms such as itching, prickly hot skin, rashes, and hives (urticaria)
• You regularly have infections, including yeast infections, thrush, or sinus infections
• You feel shortness of breath, sometimes have difficulty drawing a full breath, or often feel a need to yawn
Dana described how she determined that she needed to be tested for hypothyroidism:
I have a master’s degree in nutrition and had worked for about eight years in health care at the time as a clinical dietitian. The crunch for me came when I put a woman on a weight-loss diet. I asked her to eat about 1,800 calories per day and try to do ten minutes on the treadmill daily. Meanwhile, I was doing eleven hours of step aerobics daily, and riding my bike to and from work, and eating a strict (and I mean strict!) 1,200-calorie diet. She lost eight pounds in one week, and I gained two!
Dana’s doctor was astute enough to suspect hypothyroidism right away, and she was diagnosed and able to get on a treatment program.
Diagnosis
One possible sign of thyroid abnormality is a chronically low basal body temperature. To take a basal temperature, use a special basal thermometer, and take your temperature upon awakening before getting out of bed and moving around. Typically, basal body temperatures lower than 97.8 to 98.2 degrees Fahrenheit are thought to indicate hypothyroidism. This self-testing method was popularized by the late Dr. Broda Barnes. This test is not considered conclusive by many practitioners and does not definitively diagnose or rule out thyroid abnormalities.
To diagnose or rule out hypothyroidism, conventional doctors will typically start with a blood test that measures thyroid-stimulating hormone (TSH). As of the spring of 2003, laboratory guidelines and standards recommended that the reference range for the TSH test be revised to 0.3 to 3.0 mIU/L. Still, nearly a decade later, most American laboratories still use 0.5 to 5.5 as the normal reference range for the TSH test. When 5.5 is the top end of the normal reference range, a TSH above that level may be considered hypothyroid. With the newer guidelines, a TSH above 3.0 might be considered indicative of hypothyroidism.
Other blood tests that may be done to help diagnose hypothyroidism include:
• Total T4 (total thyroxine). A low level along with an elevated TSH may indicate hypothyroidism.
• Free T4 (free thyroxine). A low level along with an elevated TSH may indicate hypothyroidism. (Free levels refer to unbound, available thyroid hormone and are considered more accurate than total levels.)
• Total T3. A low level along with an elevated TSH may indicate hypothyroidism.
• Free T3. A low level along with an elevated TSH may indicate hypothyroidism.
• Reverse T3. A level above 150, or a ratio of free T3 to reverse T3 that exceeds 0.2 (when free T3 is measured in picograms per milliliter [pg/mL]), may indicate hypothyroidism.
• Antithyroid antibodies (thyroglobulin and microsomal). The presence of these antibodies usually indicates thyroid autoimmunity and possibly Hashimoto’s thyroiditis.
• Antithyroid peroxidase (anti-TPO) antibodies. The presence of these antibodies usually indicates autoimmunity and possibly Hashimoto’s thyroiditis.
Hashimoto’s thyroiditis is the most common cause of hypothyroidism. The characteristic Hashimoto’s thyroiditis patient has high TSH values and usually low free T3 and T4 thyroid hormone levels. However, the greatest distinguishing feature for Hashimoto’s is a high concentration of thyroid autoantibodies—anti-TPO antibodies in particular. Some patients have elevations in antibody levels for months or even years before elevation of the TSH level and a drop in the free T4 and free T3 levels.
Treating Hypothyroidism
The medical treatment for hypothyroidism is with prescription thyroid hormone replacement drugs, which are almost always taken daily.
Most commonly, conventional physicians prescribe a levothyroxine (T4-only) drug—i.e., Synthroid, Levoxyl, Levothroid—as this category of drug is considered the standard treatment for hypothyroidism. Generic levothyroxine is of good quality, but the problem is that you may wind up with generics from different makers—and thus with somewhat different potencies—with each prescription refill, making it more difficult to stabilize on a particular dose.
Integrative thyroid experts have shown through research and clinical practice that a subset of patients feel better with the addition of T3, so some practitioners are prescribing levothyroxine plus synthetic T3—known as liothyronine—in various forms.
Natural desiccated thyroid drugs—derived from the thyroid gland of pigs—are less commonly used but more popular with holistic and integrative physicians. These drugs, which contain natural forms of the T4 and T3 hormones, among other ingredients, are known by the brand names Armour Thyroid, Nature-Throid, Westhroid, and Erfa.
A more detailed discussion of hypothyroidism treatment and medications is featured in chapter 3.
HYPERTHYROIDISM
Hyperthyroidism occurs when the thyroid is overactive, producing more thyroid hormone than is necessary. Just as hypothyroidism slows down the body’s functioning, hyperthyroidism speeds it up, causing accelerated heart rate, high blood pressure, and other concerns. Hyperthyroidism may be caused by:
• An autoimmune disease (Graves’ disease) that has caused the immune system to attack the thyroid. Autoantibodies bind to the thyroid gland and cause the thyroid to overproduce thyroid hormone.
• Autoimmune Hashimoto’s disease, which can include short spurts of overactivity and hyperthyroidism before the thyroid shifts into underactivity.
• A goiter, nodule, or nodules that have caused the thyroid to inappropriately produce too much thyroid hormone.
• Excessive exposure to iodine.
• Thyroiditis, an inflammation of the thyroid that makes the thyroid overactive.
• Being hypothyroid and taking too much thyroid medication.
Symptoms
Hyperthyroid patients often have an enlarged thyroid, which can be felt by a doctor upon examination. You may be hyperthyroid if:
• You’re rapidly losing weight, or you are eating more and not gaining weight
• You’re having a hard time falling asleep or staying asleep
• You’re suffering from anxiety, irritability, nervousness, or even panic attacks
• You’re finding it difficult to concentrate
• You’re having palpitations, or your pulse and heartbeat are rapid, and blood pressure is elevated
• You’re sweating more than usual, feeling hot when others are not
• You have tremors in your hands
• You’re suffering from diarrhea
• You feel tired
• Your skin is dry, or you have a thickening of the skin on the shin area of your legs
• Your periods have stopped or are very light and infrequent
• You’re having muscle pain and weakness, especially in the upper arms and thighs
• You’re having eye problems, such as double vision or scratchy eyes, or you notice that your eyes are bulging or more of the white is showing than usual
• You’re having trouble getting pregnant
• Your hair has become fine and brittle
• Your behavior is erratic
Diagnosis
A diagnosis is usually made by a thyroid-stimulating hormone (TSH) test. Levels lower than 0.3 to 0.5 are considered possibly indicative of hyperthyroidism.
Other blood tests that may be done to help diagnose hyperthyroidism include:
• Total T4 (total thyroxine). A high level along with a low TSH may indicate hyperthyroidism.
• Free T4 (free thyroxine). A high level along with a low TSH may indicate hyperthyroidism. (Again, note that free levels measure unbound, available T4 and T3, and are considered more accurate than total levels.)
• Total T3. A high level along with a low TSH may indicate hyperthyroidism.
• Free T3. A high level along with a low TSH may indicate hyperthyroidism.
Additionally, thyroid-stimulating immunoglobulin (TSI) or thyroid-stimulating antibodies (TSAb) in your blood may also be measured to diagnose Graves’ disease, the autoimmune condition that frequently causes hyperthyroidism.
A radiographic picture of the thyroid that is taken after ingesting radioactive iodine by mouth may also be taken to see if the thyroid gland is overactive. This overactivity is a hallmark of Graves’ disease. (Note: Because radioactivity can potentially damage the unborn or breast-feeding infant’s thyroid gland, this procedure is not done during pregnancy or in nursing mothers.)
Treating Hyperthyroidism
Regardless of the method of treatment eventually used, as a first course of action a doctor may initially recommend that you take a beta-adrenergic blocking drug—also known as a beta-blocker—such as atenolol (Tenormin), nadolol (Corgard), metoprolol (Lopressor), or propranolol (Inderal) to block the action of circulating thyroid hormone in your tissue, slow your heart rate, and reduce nervousness. These drugs can be useful in rapidly reducing potentially dangerous symptoms until treatment has taken effect.
When the disease is mild, occurs in children or young adults, or needs to be promptly controlled (as with elderly patients whose heart disease puts them at risk from the increased heart rate associated with Graves’ disease), the first treatment approach is often a course of antithyroid drugs such as methimazole (Tapazole). This drug make it more difficult for your thyroid to use the iodine it needs to produce thyroid hormone, resulting in a decrease in thyroid hormone production. Outside the United States, a similar drug, carbimazole, is frequently used. Another antithyroid drug, propylthiouracil (PTU), is still used by some patients and practitioners, but carries a slightly increased risk of side effects, and so increasingly doctors prefer methimazole.
Antithyroid drugs work well for about 20 percent to 30 percent of patients. In some patients, antithyroid drug treatment for twelve to eighteen months will result in prolonged remission of the disease, particularly if the disease is relatively mild when treatment is begun. These drugs can offer as much as a 40 percent chance of remission in some patients. This is another reason to see your doctor early if you suspect you have the disease.
In about 5 percent of cases, antithyroid drugs cause allergic reactions such as skin rashes, hives, and sometimes fever and joint pains. A rarer and even more serious potential side effect is a decrease in the white blood cells that are part of the immune system, thereby resulting in a decrease in resistance to infection. In very rare cases, these cells may disappear entirely (a condition called agranulocytosis), which can be potentially fatal if there is a serious infection.
If you experience an infection while taking these drugs, call your doctor immediately. The doctor will likely tell you to stop taking the drug right away and get a white blood count that same day. If the white count has been lowered and you continue taking the drug, the infection could become fatal. However, a lowered white count will return to normal once you have stopped taking the drug.
Despite the fact that patients treated with antithyroid drugs have a decent chance of permanent remission, radioactive iodine (RAI) is the treatment of choice in the United States. In RAI, a radioactive iodine pill is given. The iodine concentrates in the thyroid, making it partially or fully inactive, and reversing the hyperthyroidism. RAI is typically followed by an elevation in thyroid antibodies, which can further aggravate the autoimmune-related symptoms. According to experts, the majority of patients do become hypothyroid for life after RAI, and while this is sometimes due to radiation-induced follicular damage, there are suggestions that this promotion of antibodies worsens the underlying thyroiditis and causes hypothyroidism.
Some practitioners recommend a technique known as block replace therapy (BRT), which involves simultaneous use of antithyroid drugs to disable the overproduction and thyroid hormone replacement to suppress function and provide sufficient thyroid hormone.
In the United States, thyroidectomy is typically done only when the patient cannot tolerate antithyroid drugs or is not a good candidate for RAI (such as in a case of life-threatening hyperthyroidism during pregnancy). This surgery involves removal of all or part of the thyroid gland and typically can provide a permanent cure for hyperthyroidism. While the goal of surgery is to remove just enough of the gland so that thyroid production is normal, it’s not often achieved. Determining how much of the gland to take is part science and part art. If too much is taken, then the patient becomes hypothyroid. If only part of the thyroid is surgically removed, hypothyroidism is still a strong possibility. There are several somewhat rare complications resulting from the surgery. One is vocal cord paralysis. Another is accidental damage to or removal of the parathyroid glands, which are located in the neck in back of the thyroid gland. Because the parathyroid glands regulate the amount of calcium in the body, their removal would result in low calcium levels.
Outside the United States, antithyroid drugs are the primary treatment, with surgery reserved for hyperthyroidism that does not respond to drug therapy.
GOITER
A goiter is an enlargement of the thyroid. The condition can be detected by ultrasound or X-ray, and may also be diagnosed visually, when the neck is visibly thicker due to the enlarged gland.
The thyroid can become enlarged due to hyperthyroidism, hypothyroidism, autoimmune thyroid disease, multiple nodules, or inflammation from thyroiditis. It can also become enlarged due to deficiency or overconsumption of iodine.
Symptoms
You may have goiter if:
• Your thyroid is enlarged, so your neck looks or feels swollen
• Your neck or thyroid area is tender to the touch
• You have a tight feeling in your throat
• You cough frequently
• Your voice is hoarse
• You have difficulty swallowing
• You have difficulty breathing and shortness of breath, especially at night
• You have a feeling that food is getting stuck in your throat
If not caused by an autoimmune condition that triggers an inflamed thyroid, a goiter can be due to the level of iodine in your body. If there’s too much iodine (e.g., from heart medications such as amiodarone), excess thyroid hormone can be produced, and a hyperthyroid goiter can appear. If there is insufficient iodine in your diet, a hypothyroid goiter can develop. The use of iodized salt has wiped out the majority of goiters from iodine deficiency in the United States, but 10 percent to 20 percent of goiters in the United States are still due to iodine deficiency, and iodine-deficiency goiter outside the United States is still common.
Diagnosis
To self-test your thyroid, hold a mirror so that you can see the area of your neck just below the Adam’s apple and right above the collarbone. This is the general location of your thyroid gland. Tip your head back while keeping this view of your neck and thyroid area in the mirror. Take a drink of water and swallow. As you swallow, look at your neck. Watch carefully for any bulges, enlargement, protrusions, or unusual appearances in this area. Repeat this process several times. If you see anything that appears unusual, contact your doctor right away. You may have an enlarged thyroid or a thyroid nodule, and your thyroid should be evaluated. Be sure you don’t get your Adam’s apple confused with your thyroid gland. The Adam’s apple is at the front of your neck; the thyroid is farther down and closer to your collarbone. (Remember that this test is by no means conclusive and cannot rule out thyroid abnormalities. It’s just helpful to identify a particularly enlarged thyroid or masses in the thyroid that warrant evaluation.)
These steps can be involved in diagnosing goiter:
• A doctor’s examination to observe neck enlargement
• A blood test to determine if your thyroid is producing irregular amounts of thyroid hormone
• An antibody test to confirm an autoimmune disease, which may be the cause of your goiter
• An ultrasound test to evaluate the size of the enlargement
• A radioactive isotope thyroid scan to produce an image of the thyroid and provide visual information about the nature of the thyroid enlargement
Treating Goiter
Treatment for goiter depends on how enlarged the thyroid has become, as well as other symptoms. Treatments can include:
• Observation and monitoring, which is typically done if your goiter is not large and is not causing symptoms or thyroid dysfunction.
• Medications, including thyroid hormone replacement, which can help shrink your goiter, or aspirin or corticosteroid drugs to shrink thyroid inflammation.
• Surgery if the goiter is very large, if it continues to grow while on thyroid hormone, if symptoms continue, or if the goiter is in a dangerous location (e.g., impinging on the windpipe or esophagus) or is cosmetically unsightly. If the goiter contains suspicious nodules, this may also be reason for surgery.
THYROID NODULES
Sometimes your thyroid gland has lumps also known as nodules. These nodules, which can be solid or fluid-filled, can be overactive and produce far too much thyroid hormone—in which case they’re called toxic nodules. When there are a lot of them, the condition is referred to as a toxic multinodular goiter. When nodules overproduce hormone, they can result in hyperthyroidism. Some nodules do not produce any hormone at all, or may impair the gland’s ability to produce thyroid hormone, and contribute to hypothyroidism. Thyroid nodules are actually fairly common. An estimated 1 in 15 women and 1 in 50 men has a thyroid nodule. More than 90 percent of nodules are benign (except in pregnant women, in whom approximately 27 percent of nodules are typically cancerous). It’s vital to have your doctor examine any nodule as soon as you notice it.
Symptoms
Symptoms of thyroid nodules include palpitations, insomnia, weight loss, anxiety, and tremors, which are all common in hyperthyroidism as well. Nodules can also trigger hypothyroidism, and symptoms might include weight gain, fatigue, and depression. Some people will cycle back and forth between hyperthyroid and hypothyroid symptoms. Others may have difficulty swallowing, feelings of fullness, pain or pressure in the neck, a hoarse voice, and neck tenderness. Many people have nodules with no obvious symptoms related to thyroid dysfunction at all.
Diagnosis
Nodules are usually evaluated by:
• A blood test to determine whether they are producing thyroid hormone
• A radioactive thyroid scan, which looks at the reaction of the nodule to small amounts of radioactive material
• An ultrasound of the thyroid to determine whether the nodule is solid or fluid-filled
• A fine-needle aspiration or needle biopsy of the nodules to determine whether they may be cancerous
Treating Thyroid Nodules
Depending on the results of the evaluation, nodules may be left alone and monitored periodically (assuming they aren’t causing serious difficulty), treated with thyroid hormone replacement to help shrink them, or surgically removed if they are causing problems with breathing or if test results indicate a malignancy. Some endocrinologists are also treating some nodules with percutaneous ethanol injections (PEI) and ultrasound, to shrink the nodules without surgery.
THYROID CANCER
Thyroid cancer is not especially common and is considered very survivable, but according to the American Cancer Society, its incidence is rising rapidly. There were an estimated 45,000 new cases of thyroid cancer in the United States in 2010.
The treatment and prognosis for thyroid cancer depends on the type. Papillary and follicular thyroid cancer are the most common types; an estimated 80 percent to 90 percent of all thyroid cancers fall into this category. Most of these cancers can be treated successfully when discovered early. Medullary thyroid carcinoma (MTC) makes up 5 percent to 10 percent of all thyroid cancers. If discovered before it metastasizes to other parts of the body, it has a good cure rate. There are two types of medullary thyroid cancer: sporadic and familial. Anyone with a family history of MTC should have blood tests to measure calcitonin levels, which may indicate a strong possibility of a genetic predisposition. If found, a thyroidectomy may be performed as a preventive measure. Anaplastic thyroid carcinoma is quite rare, accounting for only 1 percent to 2 percent of all thyroid cancers. It tends to be quite aggressive and is the least likely to respond to typical methods of treatment, though new drug treatments are showing some promise with this most difficult form of thyroid cancer.
Symptoms
Although many patients are asymptomatic at first, possible symptoms of thyroid cancer include:
• A lump in your neck
• Changes in your voice
• Difficulty in breathing or swallowing
• Lymph node swelling
Diagnosis
The main diagnostic procedure for suspected thyroid cancer is a fine-needle aspiration (FNA) biopsy of the thyroid nodule. Using a needle, fluid and cells are removed from various parts of all nodules that can be felt, and these samples are evaluated. Frequently, FNA tests are done with an ultrasound machine to help guide the needle into nodules that are too small to be felt. Between 60 percent and 80 percent of FNA tests show that the nodule is benign. Only about one in twenty FNA tests reveals cancer. If a case is classified as suspicious, a surgical biopsy may be needed.
In everyone except pregnant women, a radioactive thyroid scan is frequently done in order to identify if the nodules are “cold,” meaning they have a greater potential to be cancerous.
Treating Thyroid Cancer
There are three key treatments for patients with cancer of the thyroid. The following types are commonly used:
• Surgery (removal of the thyroid and the cancer)
• Radiation therapy (to kill remaining cancer cells)
• Hormone therapy (use of hormones to stop cancer cells from growing)
Surgery is the most common treatment of cancer for the thyroid. A doctor may remove the cancer using one of the following operations:
• Lobectomy removes only the side of the thyroid where the cancer is found. Lymph nodes in the area may be taken out (biopsied) to see if they contain cancer.
• Near-total thyroidectomy removes all of the thyroid except for a small part.
• Total thyroidectomy removes the entire thyroid.
• Lymph node dissection removes lymph nodes in the neck that contain cancer.
Radiation for cancer of the thyroid may come from a machine outside the body (external radiation therapy), but most commonly it is administered via a pill or liquid form of radioactive iodine (RAI). Because the thyroid takes up iodine, the radioactive iodine collects in any thyroid tissue remaining in the body and kills any remaining cancer cells.
After removal of the gland or radiation, patients typically end up hypothyroid for the rest of their lives, and must take thyroid replacement hormone. In some cases, suppression is also part of the thyroid cancer follow-up to help prevent a relapse of cancer; this means that the thyroid hormone replacement medication must be at a dosage to keep TSH levels low or even close to zero in some patients.
Overall, the prognosis for thyroid cancer is quite good. However, survivors need to be vigilant in case of a recurrence. Regular checkups and periodic scans by a physician are necessary to monitor for recurrence and ensure proper thyroid hormone replacement.
Thyroid Disease Risks and Symptoms Checklist
THYROID DISEASE RISK FACTORS
The following factors increase your risk of having a thyroid condition:
Age, Gender
___ Age over sixty
___ Female
Medical History
___ Past history of thyroid problems, radioactive iodine (RAI), thyroid surgery for goiter, nodules, Hashimoto’s disease, or thyroid cancer
___ Family history of thyroid problems
___ Personal or family history of autoimmune disease
___ Currently or formerly a smoker
___ Allergies or sensitivity to gluten, wheat
Related Conditions: Currently or in the past diagnosed with the following diseases or conditions:
___ Other pituitary or endocrine disease (e.g., diabetes, pituitary tumor, polycystic ovary syndrome [PCOS], endometriosis, premature menopause)
___ Chronic fatigue syndrome
___ Fibromyalgia
___ Carpal tunnel syndrome, tendonitis, plantar fasciitis
___ Mitral valve prolapse syndrome (MVPS) (heart murmur, palpitations)
___ Epstein-Barr virus (EBV)
___ Mononucleosis
___ Depression
___ Infertility, recurrent miscarriage
___ Celiac disease (gluten intolerance)
___ Lyme disease
___ Elevated cholesterol (hypercholesterolemia)
___ Tinnitus (ringing in ears)
Radiation Exposure History
___ Work at a nuclear plant
___ Live near or downwind from a nuclear plant
___ Lived near or downwind from the Chernobyl nuclear disaster in 1986
___ Had radiation treatments to neck area (e.g., for Hodgkin’s disease, nasal radium therapy, radiation to tonsils and neck area)
Medications, Supplements
___ Currently or formerly treated with lithium
___ Currently or formerly treated with amiodarone
___ Currently taking supplemental iodine, kelp, bladder wrack, or bugleweed
___ Currently taking supplemental estrogen—birth control pills or estrogen pills, patches, or creams
Dietary Factors
___ Live in midwestern “goiter belt”
___ Significantly cut back or eliminated iodized salt from diet
___ Heavy consumer of soy products
___ Heavy consumer of raw goitrogenic foods—Brussels sprouts, rutabaga, turnips, kohlrabi, radishes, cauliflower, cassava, millet, cabbage, kale, and babassu
Toxic Exposures
___ Work at a rocket fuel, fireworks, or explosives production plant
___ Live in an area where there is currently or formerly a rocket fuel, fireworks, or explosives production plant
___ Excessively exposed to mercury
___ High exposure to pesticides
___ Drink and use fluoridated water
Hormonal Status
___ Perimenopause (above age forty)
___ Menopause (no periods for a year)
___ Postmenopausal
___ Had a baby within the past year
Trauma, Injury
___ Have had serious trauma to the neck, such as whiplash from a car accident or a broken neck
THYROID DISEASE SYMPTOMS
Energy, Mood, Thinking
___ Exhaustion, fatigue
___ Depressed, moody, sad
___ Difficulty concentrating
___ Thinking is fuzzy; difficulty remembering
Anxiety, Panic
___ Heart palpitations
___ Tremors in hands
___ Panic attacks
___ Erratic behavior
___ Anxiety, irritability, nervousness, or panic attacks
Temperature
___ Sensitive to cold, cold hands or feet
___ Sweating more than usual, feeling hot when others are not, hot flashes
Weight
___ Inappropriate weight gain, or having difficulty losing weight despite changes in diet and exercise
___ Rapid weight loss, inability to gain weight
Hair, Nails, Skin
___ Dry, easily tangled, or coarse hair
___ Fine and brittle hair
___ Hair loss, especially from the outer part of the eyebrows
___ Dry or brittle nails
___ Dry skin
___ Thickening of skin in shin area of legs
___ Itching, prickly hot skin, rashes, and hives (urticaria)
Muscles, Joints, Nerves
___ Muscle and joint pains and aches
___ Carpal tunnel syndrome, or tendonitis in arms and legs
___ Soles of the feet are painful
___ Muscle pain and weakness, especially in the upper arms and thighs
___ Unusually slow or fast reflexes
Sex, Reproduction, Fertility, Menstruation
___ Low sex drive
___ Unexplained infertility, or recurrent miscarriages with no obvious explanation
___ Recurrent donor egg or IVF failure
___ Menstrual period is heavier than normal, or period is longer than it used to be or comes more frequently
___ Periods have stopped
___ Periods are very light and infrequent
Digestion
___ Constipation
___ Diarrhea
Neck, Throat
___ Full or sensitive feeling in the neck
___ Raspy, hoarse voice
___ Enlarged thyroid
___ Neck looks or feels swollen
___ Neck or thyroid area may be tender to the touch
___ Tight feeling in the throat
___ Frequent coughing
___ Difficulty swallowing
___ Difficulty breathing and shortness of breath, especially at night
___ Feeling that food is stuck in throat
Vital Signs
___ Rapid pulse
___ Elevated blood pressure
___ Slow pulse
___ Low blood pressure
Eyes
___ Double vision
___ Scratchy eyes, dry eyes, sensitivity, glare
___ Eyes are bulging or more of the white is showing than usual
Other Symptoms
___ Lymph node swelling
___ Face, eyes, arms, or legs are abnormally swollen or puffy
___ Cholesterol levels are high and not responsive to diet and medication
___ Allergies worsening
___ Frequent infections, including yeast infections, thrush, or sinus infections
___ Shortness of breath, sometimes difficulty drawing a full breath, or a need to yawn
___ Difficulty falling asleep or staying asleep
___ Antidepressant is not working
___ Estrogen therapy for menopausal symptoms is not working