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An ectopic thyroid is a condition in which some of a person's thyroid tissues or the entire gland fails to form in the right place...
By Mayo Clinic Staff. Hyperthyroidism (overactive thyroid) is a condition in which your thyroid gland produces too much of the hormone thyroxine. Hyperthyroidism can accelerate your body's metabolism significantly, causing sudden weight loss, a rapid or irregular heartbeat, sweating, and nervousness or irritability.