Pheochromocytoma is a tumor of the adrenal gland. Pheochromocytomas are quite rare and the vast majority of them are entirely benign. Only very rarely is a pheochromocytoma malignant. People with pheochromocytoma usually show these three symptoms:
- sweating, and
- heart palpitations (a fast heart beat) in association with markedly elevated blood pressure (hypertension).
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