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We describe the case of a patient who presented with hyperaldosteronism without arterial hypertension. She had been referred for consultation for persistent severe hypokalaemia despite oral KCl supplementation. The absence of hypertension had been proven by repeated clinical measurements and by ABPM. Hyperaldosteronism had been demonstrated using hormonal assays and catheterization of the adrenal veins. An abdominal CT scan revealed a left adrenal adenoma. Finally, the anatomopathological examination of the surgical specimen confirmed the adenoma. After the intervention, the patient’s serum potassium levels normalized. This clinical case is completed by a literature review of hyperaldosteronisms without arterial hypertension.