Excessive Thyroid Activity - Causes, Symptoms, and Treatment Methods
Emilia Szymańska
2026-03-23
10 min. read
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Excessive activity of the thyroid is a condition that results from excessive production of thyroid hormones. It affects 1.6% of women and 0.14% of men. Symptoms of excessive activity, such as restlessness, weight loss, heart palpitations or diarrhea, are consequences of an excessively stimulated metabolism. The most common cause of excessive activity of the thyroid is the autoimmune disease Graves' disease.
What are the symptoms of an overproduction of thyroid hormones?
Hyperthyroidism, medically known as hyperthyreosis, is a condition where the thyroid gland produces too much T3 and T4 hormones. The thyroid gland is a small gland located at the lower end of the neck. The hormones it produces include thyroxine (T4), triiodothyronine (T3), and calcitonin. Calcitonin is responsible for maintaining the body's calcium levels. Hyperthyroidism can be caused by various factors such as Graves' disease, thyroiditis, thyroid nodules, or excessive iodine intake. Symptoms of hyperthyroidism can include excessive sweating, rapid heartbeat, tremors of the hands, weight loss, muscle weakness, sleep disturbances, decreased heat tolerance, and memory and concentration difficulties.
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