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The suprarenal glands, also known as adrenal glands, belong to the endocrine system. They are a pair of triangular-shaped glands, each about 2 in long and 1 in wide, that sit on top of the kidneys (see the image below).
1 Your adrenal glands are found just above each kidney. They make certain types of hormones. If they make too much of these hormones, they are called overactive.  Symptoms depend on which hormones are being overproduced.