The endocrine system is made up of glands and organs that make hormones. The endocrine system includes the pituitary gland, thyroid gland, parathyroid glands, adrenal glands, pancreas, and ovaries or testicles.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make a gift to our 2025 Drive to Cure Cancer and transform the way cancer is treated and defeated.