Our case study concerns an observation of a 42 years old woman with pheochromocytoma. The initial clinical presentation was characterized by digestive signs related to severe hypokalaemia. During the evolution of the situation, the diagnosis of pheochromocytoma had been evoked later on, only after discovering an arterial hypertension. The 24 hours Urinary Catecholamine essay and Adrenal Imaging (CT and MRI) had confirmed this diagnosis. After surgical excision, the hypokaliemia was corrected and hypertension disappeared.