Paroxysms usually lasting <1 hour of the following symptoms:
Headache
Tremor
Alternating periods of normal and elevated blood pressure, and can cause resistant hypertension and hypertensive emergency
Tachycardia
Flushed skin
Palpitations
Diaphoresis
Anxiety
Weight loss
Headache
Tremor
Alternating periods of normal and elevated blood pressure, and can cause resistant hypertension and hypertensive emergency
Tachycardia
Flushed skin
Palpitations
Diaphoresis
Anxiety
Pheochromocytoma
Hypertensive emergency
Wilms' tumor
Stroke
Neuroblastoma 
Sympathetic crashing acute pulmonary edema
Syndrome of inappropriate antidiuretic hormone secretion
Ischemic stroke