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Adrenal Glands

Definition

The adrenal glands are two small triangle-shaped glands in the upper abdomen. One gland is located on top of each kidney.

Information

Each adrenal gland is about the size of the top part of the thumb. The outer part of the gland is called the cortex. It produces steroid hormones such as cortisol, aldosterone, and hormones that can be changed into testosterone. The inner part of the gland is called the medulla. It produces epinephrine and norepinephrine. These hormones are also called adrenaline and noradrenaline.

When the glands produce more or less hormones than normal, you can become sick. This might happen at birth or later in life.

The adrenal glands can be affected by many diseases, such as autoimmune disorders, infections, tumors, and bleeding. Some are permanent and some go away over time. Medicines can also affect the adrenal glands.

The pituitary, a small gland at the bottom of the brain, releases a hormone called ACTH that stimulates the adrenal cortex to make its hormones. Pituitary diseases can lead to problems with adrenal function.

Conditions related to adrenal gland problems include:

  • Addison disease, also called adrenal insufficiency -- an autoimmune disorder that causes the adrenal glands to not produce enough hormones
  • Congenital adrenal hyperplasia -- disorder in which the adrenal glands lack an enzyme needed to make certain hormones
  • Cushing syndrome -- disorder that occurs when the body has a high level of the hormone cortisol
  • Diabetes mellitus (high blood sugar) caused by the adrenal gland making too much cortisol
  • Glucocorticoid medicines such as prednisone, methylprednisolone, dexamethasone, and hydrocortisone
  • Excessive or unwanted hair in women (hirsutism)
  • Hump behind shoulders (dorsocervical fat pad)
  • Hypoglycemia -- low blood sugar
  • Primary aldosteronism (Conn syndrome) -- disorder in which the adrenal gland releases too much of the hormone aldosterone
  • Massive bilateral adrenal hemorrhage (Waterhouse-Friderichsen syndrome) -- failure of adrenal glands to function as a result of bleeding into the gland, usually associated with severe infection, called sepsis
Endocrine glands
Endocrine glands release hormones (chemical messengers) into the bloodstream to be transported to various organs and tissues throughout the body. For instance, the pancreas secretes insulin, which allows the body to regulate levels of sugar in the blood. The thyroid gets instructions from the pituitary to secrete hormones which determine the rate of metabolism in the body (the more hormone in the bloodstream, the faster the chemical activity; the less hormone, the slower the activity).
Adrenal glands
Triangular-shaped glands located on top of the kidneys. They produce steroid hormones such as aldosterone, cortisol, and precursor sex steroids that can be converted into estrogen and testosterone. They also produce the hormones adrenalin (epinephrine) and noradrenalin (norepinephrine).
Endocrine glands
Endocrine glands release hormones (chemical messengers) into the bloodstream to be transported to various organs and tissues throughout the body. For instance, the pancreas secretes insulin, which allows the body to regulate levels of sugar in the blood. The thyroid gets instructions from the pituitary to secrete hormones which determine the rate of metabolism in the body (the more hormone in the bloodstream, the faster the chemical activity; the less hormone, the slower the activity).

References

Friedman TC. Adrenal gland. In: Wing EJ, Schiffman FJ, eds. Cecil Essentials of Medicine. 10th ed. Philadelphia, PA: Elsevier; 2022:chap 66.

Newell-Price JDC, Auchus RJ. The adrenal cortex. In: Melmed S, Auchus, RJ, Goldfine AB, Koenig RJ, Rosen CJ, eds. Williams Textbook of Endocrinology. 14th ed. Philadelphia, PA: Elsevier; 2020:chap 15.

Standring S. Suprarenal (adrenal) gland. In: Standring S, ed. Gray's Anatomy. 42nd ed. Philadelphia, PA: Elsevier; 2021:chap 70.

Last reviewed May 20, 2024 by Sandeep K. Dhaliwal, MD, board-certified in Diabetes, Endocrinology, and Metabolism, Springfield, VA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team..

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