Overview

Graves' disease is an immune system disorder that results in the overproduction of thyroid hormones (hyperthyroidism). Although a number of disorders may result in hyperthyroidism, Graves' disease is a common cause.

Because thyroid hormones affect a number of different body systems, signs and symptoms associated with Graves' disease can be wide ranging and significantly influence your overall well-being. Although Graves' disease may affect anyone, it's more common among women and before the age of 40.

The primary treatment goals are to inhibit the overproduction of thyroid hormones and lessen the severity of symptoms.

Grave's disease care at Mayo Clinic

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Symptoms

Common signs and symptoms of Graves' disease include:

• Anxiety and irritability
• A fine tremor of your hands or fingers
• Heat sensitivity and an increase in perspiration or warm, moist skin
• Weight loss, despite normal eating habits
• Enlargement of your thyroid gland (goiter)
• Change in menstrual cycles
• Erectile dysfunction or reduced libido
• Frequent bowel movements
• Bulging eyes (Graves' ophthalmopathy)
• Fatigue
• Thick, red skin usually on the shins or tops of the feet (Graves' dermopathy)
• Rapid or irregular heartbeat (palpitations)

Graves' ophthalmopathy

About 30 percent of people with Graves' disease show some signs and symptoms of a condition known as Graves' ophthalmopathy. In Graves' ophthalmopathy, inflammation and other immune system events affect muscles and other tissues around your eyes. The resulting signs and symptoms may include:

• Bulging eyes (exophthalmos)
• Gritty sensation in the eyes
• Pressure or pain in the eyes
• Puffy or retracted eyelids
• Reddened or inflamed eyes
• Light sensitivity
• Double vision
• Vision loss

Graves' dermopathy

An uncommon manifestation of Graves' disease, called Graves' dermopathy, is the reddening and thickening of the skin, most often on your shins or the tops of your feet.

When to see a doctor

A number of medical conditions can cause the signs and symptoms associated with Graves' disease. See your doctor if you experience any potential problems related to Graves' disease to get a prompt and accurate diagnosis.

Seek emergency care if you're experiencing heart-related signs and symptoms, such as a rapid or irregular heartbeat, or if you develop vision loss.

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Causes

Graves' disease is caused by a malfunction in the body's disease-fighting immune system, although the exact reason why this happens is still unknown.

One normal immune system response is the production of antibodies designed to target a specific virus, bacterium or other foreign substance. In Graves' disease — for reasons that aren't well understood — the body produces an antibody to one part of the cells in the thyroid gland, a hormone-producing gland in the neck.

Normally, thyroid function is regulated by a hormone released by a tiny gland at the base of the brain (pituitary gland). The antibody associated with Graves' disease — thyrotropin receptor antibody (TRAb) — acts like the regulatory pituitary hormone. That means that TRAb overrides the normal regulation of the thyroid, causing an overproduction of thyroid hormones (hyperthyroidism).

Cause of Graves' ophthalmopathy

This condition results from a buildup of certain carbohydrates in the muscles and tissues behind the eyes — the cause of which also isn't known. It appears that the same antibody that can cause thyroid dysfunction may also have an "attraction" to tissues surrounding the eyes.

Graves' ophthalmopathy often appears at the same time as hyperthyroidism or several months later. But signs and symptoms of ophthalmopathy may appear years before or after the onset of hyperthyroidism. Graves' ophthalmopathy can also occur even if there's no hyperthyroidism.

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Diagnosis

The diagnosis of Graves' disease may include:

• Physical exam. Your doctor examines your eyes to see if they're irritated or protruding and looks to see if your thyroid gland is enlarged. Because Graves' disease increases your metabolism, your doctor will check your pulse and blood pressure and look for signs of tremor.

• Blood sample. Your doctor will order blood tests to determine your levels of thyroid-stimulating hormone (TSH), the pituitary hormone that normally stimulates the thyroid gland, as well as levels of thyroid hormones. People with Graves' disease usually have lower than normal levels of TSH and higher levels of thyroid hormones.

  Another laboratory test measures the levels of the antibody known to cause Graves' disease. This test usually isn't necessary to make a diagnosis, but a negative result might indicate another cause for hyperthyroidism.

• Radioactive iodine uptake. Your body needs iodine to make thyroid hormones. By giving you a small amount of radioactive iodine and later measuring the amount of it in your thyroid gland with a specialized scanning camera, your doctor can determine the rate at which your thyroid gland takes up iodine. The amount of radioactive iodine taken up by the thyroid gland helps determine if Graves' disease or another condition is the cause of the hyperthyroidism. This test may be combined with a radioactive iodine scan to show a visual image of the uptake pattern.
• Ultrasound. Ultrasound uses high-frequency sound waves to produce images of structures inside the body. Ultrasound can show if the thyroid gland is enlarged, and is most useful in people who can't undergo radioactive iodine uptake, such as pregnant women.
• Imaging tests. If the diagnosis of Graves' ophthalmopathy isn't clear from a clinical assessment, your doctor may order an imaging test, such as CT scan, a specialized X-ray technology that produces thin cross-sectional images. Magnetic resonance imaging (MRI), which uses magnetic fields and radio waves to create either cross-sectional or 3-D images, also may be used.

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Complications

Complications of Graves' disease can include:

• Pregnancy issues. Possible complications of Graves' disease during pregnancy include miscarriage, preterm birth, fetal thyroid dysfunction, poor fetal growth, maternal heart failure and preeclampsia. Preeclampsia is a maternal condition that results in high blood pressure and other serious signs and symptoms.
• Heart disorders. If left untreated, Graves' disease can lead to heart rhythm disorders, changes in the structure and function of the heart muscles, and the inability of the heart to pump enough blood to the body (congestive heart failure).

• Thyroid storm. A rare, but life-threatening complication of Graves' disease is thyroid storm, also known as accelerated hyperthyroidism or thyrotoxic crisis. It's more likely when severe hyperthyroidism is untreated or treated inadequately.

  The sudden and drastic increase in thyroid hormones can produce a number of effects, including fever, profuse sweating, vomiting, diarrhea, delirium, severe weakness, seizures, markedly irregular heartbeat, yellow skin and eyes (jaundice), severe low blood pressure, and coma. Thyroid storm requires immediate emergency care.

• Brittle bones. Untreated hyperthyroidism also can lead to weak, brittle bones (osteoporosis). The strength of your bones depends, in part, on the amount of calcium and other minerals they contain. Too much thyroid hormone interferes with your body's ability to incorporate calcium into your bones.

Lifestyle and home remedies

If you have Graves' disease, make your mental and physical well-being a priority:

• Eating well and exercising can enhance the improvement in some symptoms while being treated and help you feel better in general. For example, because your thyroid controls your metabolism, you may have a tendency to gain weight when the hyperthyroidism is corrected. Brittle bones also can occur with Graves' disease, and weight-bearing exercises can help maintain bone density.
• Easing stress as much as you can may be helpful, as stress may trigger or worsen Graves' disease. Listening to music, taking a warm bath or walking can help relax you and put you in a better frame of mind. Partner with your doctor to construct a plan that incorporates good nutrition, exercise and relaxation into your daily routine.

For Graves' ophthalmopathy

These steps may make your eyes feel better if you have Graves' ophthalmopathy:

• Apply cool compresses to your eyes. The added moisture may soothe your eyes.
• Wear sunglasses. When your eyes protrude, they're more vulnerable to ultraviolet rays and more sensitive to bright light. Wearing sunglasses that wrap around the sides of your head will also lessen the irritation of your eyes from the wind.
• Use lubricating eyedrops. Eyedrops may relieve the dry, scratchy sensation on the surface of your eyes. A paraffin-based gel, such as Lacri-Lube, can be applied at night.
• Elevate the head of your bed. Keeping your head higher than the rest of your body lessens fluid accumulation in the head and may relieve the pressure on your eyes.
• Don't smoke. Smoking worsens Graves' ophthalmopathy.

For Graves' dermopathy

If the disease affects your skin (Graves' dermopathy), use over-the-counter creams or ointments containing hydrocortisone to relieve swelling and reddening. In addition, using compression wraps on your legs may help.

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Risk factors

Although anyone can develop Graves' disease, a number of factors can increase the risk of disease. These risk factors include the following:

• Family history. Because a family history of Graves' disease is a known risk factor, there is likely a gene or genes that can make a person more susceptible to the disorder.
• Gender. Women are much more likely to develop Graves' disease than are men.
• Age. Graves' disease usually develops in people younger than 40.
• Other autoimmune disorders. People with other disorders of the immune system, such as type 1 diabetes or rheumatoid arthritis, have an increased risk.
• Emotional or physical stress. Stressful life events or illness may act as a trigger for the onset of Graves' disease among people who are genetically susceptible.
• Pregnancy. Pregnancy or recent childbirth may increase the risk of the disorder, particularly among women who are genetically susceptible.
• Smoking. Cigarette smoking, which can affect the immune system, increases the risk of Graves' disease. Smokers who have Graves' disease are also at increased risk of developing Graves' ophthalmopathy.

Source: http://www.mayoclinic.com