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Hyperthyroidism is the condition that occurs due to excessive production of thyroid hormones by the thyroid gland. [3] Thyrotoxicosis is the condition that occurs due to excessive thyroid hormone of any cause and therefore includes hyperthyroidism. [3] Some, however, use the terms interchangeably. [5]
It frequently results in and is the most common cause of hyperthyroidism. [5] It also often results in an enlarged thyroid. [1] Signs and symptoms of hyperthyroidism may include irritability, muscle weakness, sleeping problems, a fast heartbeat, poor tolerance of heat, diarrhea and unintentional weight loss. [1]
Graves’ disease is the most common cause of hyperthyroidism, says Dr. Amy S. Chang, MD, a clinical associate professor of medicine and head of the division of Diabetes & Endocrinology at Scripps ...
This causes the receptor to activate even without TSH being present and causes the thyroid to produce and release excess thyroid hormone (hyperthyroidism). [4] Another common form of autoimmune thyroid disease is Hashimoto's thyroiditis where the body produces antibodies against different normal components of the thyroid gland, most commonly ...
Toxic multinodular goiter is the second most common cause of hyperthyroidism (after Graves' disease) in the developed world, whereas iodine deficiency is the most common cause of hypothyroidism in developing-world countries where the population is iodine-deficient. (Decreased iodine leads to decreased thyroid hormone.)
Also known as hyperthyroid myopathy, TM is one of many myopathies that lead to muscle weakness and muscle tissue breakdown. Evidence indicates the onset may be caused by hyperthyroidism . [ 1 ] Physical symptoms of TM may include muscle weakness , the breakdown of muscle tissue, fatigue , and heat intolerance . [ 2 ]