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What Kind of Doctor Specializes in Thyroid & Adrenal Fatigue? The human body has several glands that secrete small amounts of substances called hormones. Important among these are the pituitary gland in the brain, thyroid gland in the neck, and the adrenal glands, positioned above each kidney. Sometimes, when people feel tired, they hold these glands responsible.
Pituitary Gland. Anatomy of the pituitary gland. The pituitary gland is sometimes called the master gland of the endocrine system because it controls the functions of many of the other endocrine glands. The pituitary gland is no larger than a pea, and is located at the base of the brain.