Pheochromocytoma is a rare tumor that usually develops in the adrenal gland, causing an overproduction of adrenaline and other stress hormones. There are a few different synonyms for this condition, including chromaffin cell tumor, paraganglioma, and adrenal medullary tumor. These terms refer to the same type of tumor, but may be used in different medical contexts or based on the location of the tumor. Pheochromocytoma can cause a range of symptoms, including high blood pressure, headaches, sweating, and heart palpitations. It usually requires medical intervention, such as surgery or medication, to manage the condition and prevent serious complications.