Common symptoms and signs are Tachycardia Diaphoresis Postural hypotension Tachypnea Cold and clammy skin Severe headache Angina Palpitations Nausea and vomiting Epigastric pain Visual disturbances Dyspnea Paresthesias Constipation A sense of impending doom Paroxysmal attacks may be provoked by palpation of the tumor, postural changes, abdominal compression or massage, induction of anesthesia, emotional trauma, unopposed beta-blockade (which paradoxically increases blood pressure by blocking beta-mediated vasodilation), or micturition (if the tumor is in the bladder).