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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.
The pituitary is a pea-sized gland that is housed within a bony structure (sella turcica) at the base of the brain. The sella turcica protects the pituitary but allows very little room for expansion. The pituitary controls the function of most other endocrine glands and is therefore sometimes called the master gland. In turn, the pituitary is controlled in large part by the hypothalamus, a region of the brain that lies just above the pituitary.