Hypertension is classified as primary (essential) or secondary based on whether there is an identifiable cause. When it is determined a certain underlying cause of hypertension it is categorized as secondary hypertension. Conn's syndrome (primary hyperaldosteronism), a disorder of adrenal cortex characterized by exces aldosterone secretion, is an endocrine disorder that causes hypertension and it is seen in about 0.1% of all patients with hypertension. It can be caused by either unilateral disease (i.e. adenoma in one adrenal gland) or bilateral disease (i.e. hyperplasia in both adrenal glands). Conn's syndrome secondary to bilateral adrenal adenoma, a cause of secondary hypertension, was presented in this articleas it is rarely reported in the literature.