Hashimoto's thyroiditis

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

The way the body defends itself against infection, disease and outside substances.

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.