Graves’ disease causes the thyroid gland to become overactive. It is an autoimmune disease in which the body fights against itself and causes the thyroid gland to become overactive.
Goiter refers to an enlarged thyroid gland. A goiter can develop in one or both sides of the thyroid gland.
In hyperthyroidism, the thyroid gland is producing too much hormone. This excess of thyroid hormone causes the body’s metabolism to be overactive.