Hypothyroidism

Two iodine-containing hormones called thyroxine (T4) and triiodothyronine (T3). They help regulate the body's metabolism and calcium balance.

A two-lobed gland located in the front of the neck below the larynx (voice box). It secretes hormones that help regulate the body's metabolism and calcium balance.

An abnormal condition in the body causing harm.

Any organ or tissue that secretes fluids, such as hormones, for use elsewhere in the body or as waste.