Pheochromocytoma can be generally described as a rare tumor of adrenal gland tissue. This book elucidates the pathophysiology of pheochromocytoma, portraying anatomological and histopathological characteristics, experimental models and signaling pathways and programmed cell death associated with pheochromocytoma. It elucidates particular characteristics of clinical presentation, focusing on clinical manifestations of headache and heart. It also provides description of clinical diagnosis, imaging and laboratory, encompassing differential diagnosis. The book describes the treatment of pheochromocytoma with the help of various clinical cases. For example, a case regarding catecholamine-secreting hereditary tumors and another one associated with undiagnosed pheochromocytoma complicated with multiple organ failure have been presented. Therefore, it is justified to say that this book presents the disease of pheochromocytoma in a different perspective from the conventional approach.