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Hyperthyroidism is a health condition caused by overproduction of thyroid hormone by the thyroid gland.

The thyroid is one of your body's "master" glands, meaning that it influences and regulates overall metabolism and the overall health of most of the cells in your body, including helping to form protein RNA (the building blocks of life) for every cell and to increase oxygen consumption by most cells. Located at the base of the neck, the thyroid gland consists of two lobes, one on each side of the windpipe (trachea).

Symptoms of hyperthyroidism include rapid heartbeat, enlarged thyroid (goiter), moist skin, trembling or tremors, erratic pulse pressure levels (too high or too low), fatigue, anxiety, weight loss, bulging eyes, excessive sweating, increased appetite, low tolerance to heat, diarrhea, chest pain, and gastrointestinal disorders. In older people with hyperthyroidism, however, the opposite of the above symptoms can occur. Overall, hyperthyroidism is more rare than hypothyroidism (underactive thyroid function).

Hyperthyroidism may be associated with and often is called Graves' disease, a condition characterized by an enlarged thyroid, bulging eyes bulge, rash and swelling in front of the lower leg.

An abnormal immune response is believed be a possible cause of hypothyroidism. The exact cause is not known, but certain antibodies from the immune system will launch an assault on the thyroid, disturbing hormone production. Lumps or tumors that form on the thyroid also disrupt hormone production. Temporary hyperthyroidism can be caused by infection or inflammation, and certain prescription drugs.

Hyperthyroidism is less common than Hypothyroidism, yet for both diseases, women appear to be more susceptible than men. Be aware that a malfunctioning thyroid may be the cause of recurring illnesses.