Woman With Thyroid Issues
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When Your Thyroid Goes Awry

Does fatigue drag you down day after day? Do you have brain fog, weight gain, chills, or hair loss? Or is the opposite true for you: Are you often revved up, sweaty, or anxious? Your thyroid gland could be to blame. This great regulator of body and mind sometimes goes haywire, particularly in women. Getting the right treatment is critical to feel your best and avoid serious health problems.

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Illustration Of Thyroid Gland
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What Is the Thyroid Gland?

The thyroid is a butterfly-shaped gland in the front of the neck. It produces hormones that control the speed of your metabolism -- the system that helps the body use energy. Thyroid disorders can slow down or rev up metabolism by disrupting the production of thyroid hormones. When hormone levels become too low or too high, you may experience a wide range of symptoms.

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Woman Having Trouble Buttoning Pants
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Symptom: Weight Gain or Loss

An unexplained change in weight is one of the most common signs of a thyroid disorder. Weight gain may signal low levels of thyroid hormones, a condition called hypothyroidism. In contrast, if the thyroid produces more hormones than the body needs, you may lose weight unexpectedly. This is known as hyperthyroidism. Hypothyroidism is far more common.

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Woman With Swollen Thyroid
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Symptom: Swelling in the Neck

A swelling or enlargement in the neck is a visible clue that something may be wrong with the thyroid. A goiter may occur with either hypothyroidism or hyperthyroidism. Sometimes swelling in the neck can result from thyroid cancer or nodules, lumps that grow inside the thyroid. It can also be due to a cause unrelated to the thyroid.

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Nurse Checking Pulse
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Symptom: Changes in Heart Rate

Thyroid hormones affect nearly every organ in the body and can influence how quickly the heart beats. People with hypothyroidism may notice their heart rate is slower than usual. Hyperthyroidism may cause the heart to speed up. It can also trigger increased blood pressure and the sensation of a pounding heart, or other types of heart palpitations.

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Woman Yawning At Home
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Symptom: Changes in Energy or Mood

Thyroid disorders can have a noticeable impact on your energy level and mood. Hypothyroidism tends to make people feel tired, sluggish, and depressed. Hyperthyroidism can cause anxiety, problems sleeping, restlessness, and irritability.

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Thyroid Issues May Cause Hair Loss
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Symptom: Hair Loss

Hair loss is another sign that thyroid hormones may be out of balance. Both hypothyroidism and hyperthyroidism can cause hair to fall out. In most cases, the hair will grow back once the thyroid disorder is treated.

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Temperature Fluctuation Due To Thyroid Issues
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Symptom: Feeling Too Cold or Hot

Thyroid disorders can disrupt the ability to regulate body temperature. People with hypothyroidism may feel cold more often than usual. Hyperthyroidism tends to have the opposite effect, causing excessive sweating and an aversion to heat.

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Woman With Hypothyroidism
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Other Symptoms of Hypothyroidism

Hypothyroidism can cause many other symptoms, including:

  • Dry skin and brittle nails
  • Numbness or tingling in the hands
  • Constipation
  • Abnormal menstrual periods
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Woman Looking Through Glasses
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Other Symptoms of Hyperthyroidism

Hyperthyroidism can also cause additional symptoms, such as:

  • Muscle weakness or trembling hands
  • Vision problems
  • Diarrhea
  • Irregular menstrual periods
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Woman Having Temperature Issues
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Thyroid Disorder or Menopause?

Because thyroid disorders can cause changes in menstrual cycle and mood, the symptoms are sometimes mistaken for menopause. If a thyroid problem is suspected, a simple blood test can determine whether the true culprit is menopause or a thyroid disorder -- or a combination of the two.

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Checking Womans Thyroid For Swelling
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Who Should Be Tested?

If you think you have symptoms of a thyroid problem, ask your doctor if you should be tested. People with symptoms or risk factors may need tests more often. Hypothyroidism more frequently affects women over age 60. Hyperthyroidism is also more common in women. A family history raises your risk of either disorder.

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Thyroid Neck Check
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Thyroid Neck Check

A careful look in the mirror may help you spot an enlarged thyroid that needs a doctor's attention. Tip your head back, take a drink of water, and as you swallow, examine your neck below the Adam's apple and above the collarbone. Look for bulges or protrusions, then repeat the process a few times. See a doctor promptly if you see a bulge or lump.

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Blood Test Analysis
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Diagnosing Thyroid Disorders

If your doctor suspects a thyroid disorder, a blood test can help provide an answer. This test measures the level of thyroid stimulating hormone (TSH), a kind of master hormone that regulates the work of the thyroid gland. If TSH is high, it typically means that your thyroid function is too low (hypothyroid). If TSH is low, then it generally means the thyroid is overactive (hyperthyroid.) Your doctor may also check levels of other thyroid hormones in your blood. In some cases, imaging studies are used and biopsies are taken to evaluate a thyroid abnormality.

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Illustration Of Hashimotos Disease
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Hashimoto's Disease

The most common cause of hypothyroidism is Hashimoto's disease. This is an autoimmune disorder in which the body attacks the thyroid gland. The result is damage to the thyroid, preventing it from producing enough hormones. Hashimoto's disease tends to run in families.

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Illustration Of Pituitary Gland
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Other Causes of Hypothyroidism

In some cases, hypothyroidism results from a problem with the pituitary gland, which is at the base of the brain. This gland produces thyroid-stimulating hormone (TSH), which tells the thyroid to do its job. If your pituitary gland does not produce enough TSH, levels of thyroid hormones will fall. Other causes of hypothyroidism include temporary inflammation of the thyroid or medications that affect thyroid function.

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Bulging Eyes From Graves Disease
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Graves' Disease

The most common cause of hyperthyroidism is Graves' disease. This is an autoimmune disorder that attacks the thyroid gland and triggers the release of high levels of thyroid hormones. One of the hallmarks of Graves' disease is a visible and uncomfortable swelling behind the eyes.

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Nodule In Thyroid Gland
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Other Causes of Hyperthyroidism

Hyperthyroidism can also result from thyroid nodules. These are lumps that develop inside the thyroid and sometimes begin producing thyroid hormones. Large lumps may create a noticeable goiter. Smaller lumps can be detected with ultrasound. A thyroid uptake and scan can tell if the lump is producing too much thyroid hormone.

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Doctor Discussing Thyroid Issues
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Thyroid Disorder Complications

When left untreated, hypothyroidism can raise cholesterol levels and make you more likely to have a stroke or heart attack. In severe cases, very low levels of thyroid hormones can trigger a loss of consciousness and life-threatening drop in body temperature. Untreated hyperthyroidism can cause serious heart problems and brittle bones.

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Treating Hypothyroidism With Medication
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Treating Hypothyroidism

If you are diagnosed with hypothyroidism, your doctor will most likely prescribe thyroid hormones in the form of a pill. This usually leads to noticeable improvements within a couple of weeks. Long-term treatment can result in more energy, lower cholesterol levels, and gradual weight loss. Most people with hypothyroidism will need to take thyroid hormones for the rest of their lives.

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Treating Hypothyroidism With Radioactive Iodine
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Treating Hyperthyroidism

The most common treatment for hyperthyroidism is antithyroid medication, which aims to lower the amount of hormones produced by the thyroid. The condition may eventually go away, but many people need to remain on medication for the long term. Other drugs may be given to reduce symptoms such as rapid pulse and tremors. Another option is radioactive iodine, which destroys the thyroid gland over the course of 6 to 18 weeks. Once the gland is destroyed, or removed by surgery, most patients must begin taking thyroid hormones in pill form.

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Surgeon Removing Thyroid
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Surgery for Thyroid Disorders

Removing the thyroid gland can cure hyperthyroidism, but the procedure is only recommended if antithyroid drugs don't work, or if there is a large goiter. Surgery may also be recommended for patients with thyroid nodules. Once the thyroid is removed, most patients require daily supplements of thyroid hormones to avoid developing hypothyroidism.

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Scintigram Showing Thyroid Cancer
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What About Thyroid Cancer?

Thyroid cancer is uncommon and is among the least deadly. The main symptom is a lump or swelling in the neck, and only about 5% of thyroid nodules turn out to be cancerous. When thyroid cancer is diagnosed, it is most often treated with surgery followed by radioactive iodine therapy or, in some cases, external radiation therapy.  

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Sources | Medically Reviewed on 04/18/2016 Reviewed by William Blahd, MD on April 18, 2016

IMAGES PROVIDED BY:

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REFERENCES: 

American Academy of Family Physicians.
American Association of Clinical Endocrinologists web site.
American Cancer Society web site.
American Thyroid Association web site.
National Cancer Institute web site.
National Endocrine and Metabolic Diseases Information Service.
National Institutes of Health web site.
The Hormone Foundation web site.

Reviewed by William Blahd, MD on April 18, 2016

This tool does not provide medical advice. See additional information.

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.