Overview

A pheochromocytoma (fee-o-kroe-moe-sy-TOE-muh) is a rare, usually noncancerous (benign) tumor that develops in an adrenal gland. Usually, this type of tumor affects one of your two adrenal glands, but it can affect both.

If you have a pheochromocytoma, the tumor releases hormones that cause either episodic or persistent high blood pressure. Untreated, a pheochromocytoma can result in severe or life-threatening damage to other body systems, especially the cardiovascular system.

Most people with a pheochromocytoma are between the ages of 20 and 50, but the tumor can develop at any age. Surgical treatment to remove a pheochromocytoma usually returns blood pressure to normal.