<prompt> Most common paroxysmal symptom of pheochromocytoma:HeadachePalpitationAbdominal painHypotension  <response>: Answer is A Headache: The single most common paroxysmal symptom repoed in patients with pheochromocytoma is headache Most adult patients have paroxysmal symptoms, lasting minutes to hours, consisting of headache 80, perspiration 70, and palpitations 60 - Endocrine Tumors PMPH-USA, 2003 104 The three most commonly repoed paroxysmal symptoms in pheochromocytoma are Headache, Palpitations and Excessive or inappropriate sweating. Almost all patients will have one of three symptoms above and most will have at least two. The most common and predominant sign of Pheochromocytoma is Hypeension 