what is pheochromocytoma caused by
Pheochromocytoma (PCC) is a rare tumor of adrenal gland tissue. The adrenal glands are located above the kidneys. The adrenals produce a number of hormones, including aldosterone, testosterone, cortisol, norepinephrine, and epinephrine.These hormones regulate vital bodily functions such as blood pressure, stress, blood sugar, immune response, metabolism, and heart rate.n the case of PCC, the tumors cause your adrenal glands to make too much norepinephrine and epinephrine. Pheochromocytoma is rarely cancerous, but it can be dangerous due to fluctuating hormone levels. Eighty five percent of PCCs are in the adrenal glands themselves.