Primary hyperaldosteronism due to increased secretion of aldosterone from unilateral benign (glomerulosa layer) adenoma (85%), bilateral adenomas (5%) or bilateral adrenal hyperplasia (10%); marked by decreased renin secretion, hypervolemia, alkalosis, hypokalemia, hypernatremia, hyperchlorhydria, headaches, hypertension (esp. diastolic), polydipsia, and polyuria. Hypertension is surgically correctable in this condition.