Hyperthyroidism is a condition that results from an overactive the thyroid gland. The thyroid glands produce T3 and T4 to regulate metabolism within the body cells. Hyperthyroidism occurs when the gland starts producing excess amounts of the hormones. Several factors can lead to this condition including grave's disease, excess iodine, inflammation of the glands, or tumors of the ovaries or testes. An overproduction of the hormones can lead to a high metabolic rate. The common symptoms of this condition include (but are not limited to) increased appetite, weight loss, difficulty in sleeping, irregular bowel movements and rapid heart rate. Treatments for Hyperthyroidism depend on the underlying cause of the condition and the severity of symptoms. The endocrinologist may consider your age and other medical conditions before deciding on the line of treatment. Anti-thyroid medications commonly prescribed by endocrinologists begin to show results in six to twelve weeks. They work by preventing your thyroid gland from producing excess amounts of hormones. The medication has to be continued at least for a year after which it is slowly tapered off. Some individuals may have an allergic reaction to these drugs. Anti- thyroid medications can cause severe liver damage. Administration of Radioactive iodine has been another line of treatment for hyperthyroidism. The thyroid gland absorbs the radioactive iodine as a result of which it shrinks. However, in the long run, it may affect causes perpetual underproduction of the hormones and medication may be required to supplement the deficient hormones.