Hypertension usually does not cause hypokalemia, but two conditions should be ruled out: 1, whether the patient is suffering from primary aldosteronism in secondary hypertension, which is an endocrine disease in which the adrenal cortex secretes too much aldosterone, resulting in the retention of too much sodium and excretion of too much potassium in the body, which in turn manifests as hypertension, hypokalemia, muscle weakness and increased nocturia. Patients can go to cardiology or endocrinology clinics for CT scans of the adrenal glands and determination of plasma aldosterone-to-renin activity ratios to clarify the diagnosis. 2. Patients taking oral antihypertensive drugs containing potassium-excluding drugs, such as hydrochlorothiazide or indapamide, can be clearly diagnosed by taking a medical history. Patients with hypokalemia usually have symptoms such as numbness of the limbs, gastrointestinal distention, muscle weakness and episodic flaccidity, and may even induce rapid-type malignant arrhythmia, so they need to monitor electrolytes and replenish blood potassium to normal range.