Definitions

Below is a list of some of the common hypothyroidism related terms you will find when researching our website:

Gland – A group of cells that secretes a substance or removes materials from circulation

Hormone – Hormones regulate and control the activities of the cells and organs in the body.

Immune system – The immune system protects the body from infections and foreign substances. It is constantly working to seek and kill invaders that have the potential to harm the body.

Levothyroxine – Synthetic T4 thyroid hormone found in various thyroid hormone replacement drugs used to treat hypothyroidism.

Metabolism – Refers to the biochemical processes that occur in the body. Metabolism involves the buildup (anabolism) or breakdown (catabolism) of proteins in the body.

Pituitary gland – A small, pea-sized gland in the head that produces important hormones that control other glands. The pituitary gland is responsible for many body functions.

Thyroid hormone – The hormones produced by the thyroid gland, which are thyroxine (T4) and triiodothyronine (T3). They assist the regulation of metabolic reactions in the body.

Thyroid Stimulating Hormone (TSH) – Is produced by the pituitary gland. It receives its instructions from the hypothalamus. TSH signals the thyroid to produce more or less thyroid hormones in response to how the body is functioning.

T3 (Triiodothyronine) – An iodine-containing thyroid hormone that controls the metabolic functions of the body.

T4 (Thyroxine) – An iodine-containing thyroid hormone the body converts to T3 (triiodothyronine), its usable, active form.

Thyroiditis – Inflammation of the thyroid gland.