For Pheochromocytoma we have terms and definitions in 3 topics. The topics are Alternative Health, Cancer and Medical.

a condition in which there is a tumour of the adrenal medulla or of the structurally similar tissues associated with the sympathetic chain
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A tumor of the adrenal gland that causes it to produce too much adrenaline. Pheochromocytomas are usually benign (noncancerous), but can cause dangerously high blood pressure and other symptoms, including pounding headaches, heart palpitations, flushing of the face, nausea, and vomiting.
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A noncancerous tumor of cells that produce epinephrine and norepinephrine, causing higher levels of these hormones in the blood and an increase in blood pressure
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