Symptoms and Signs of Hyperthyroidism

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Medically Reviewed on 3/11/2019

Doctor's Notes on Hyperthyroidism

Hyperthyroidism refers to the presence of an overactive thyroid gland or the presence of elevated levels of thyroid hormone. The thyroid gland plays an important role in regulating numerous metabolic processes throughout the body. Graves' disease is the most common cause of hyperthyroidism. Many other health problems, including taking an excess of thyroid hormone medication, can cause elevated levels of thyroid hormones in the bloodstream. 

Signs and symptoms of hyperthyroidism can include increased heart rate, weight loss, heart palpitations, frequent bowel movements, fine or brittle hair, sleep problems, depression, thinning skin, fatigue, and irregular vaginal bleeding or problems with menstruation in women.¬†Other symptoms can include agitation, restlessness, intolerance to heat, tremors, and anxiety. Graves’ disease can also be associated with eye disease and apparent bulging of the eyes.

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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.