Swelling of the legs due to high blood pressure can be combined with heart failure, kidney failure and other diseases, which are more dangerous. It may also be caused by taking certain medications, which are not dangerous. 1. Heart failure: long-term high blood pressure can lead to left ventricular hypertrophy and dilatation, which can gradually develop into hypertensive heart disease. Hypertensive heart disease is often combined with coronary artery atherosclerosis, with the condition of tension, can eventually develop into heart failure. Heart failure, lower extremity edema symptoms can occur. 2. Renal failure: long-term hypertension can cause glomerular capsule pressure, renal arteriosclerosis, glomerular fibrosis, renal parenchyma ischemia, reduction of renal units, which can gradually develop into chronic renal failure. Patients with chronic renal failure may have lower limb edema. 3. Drugs: hypertensive patients taking nifedipine or amlodipine and other antihypertensive drugs may have peripheral edema and other adverse reactions, showing leg swelling. It is recommended to change the drugs under the guidance of the doctor. Hypertensive patients with symptoms of leg swelling are recommended to go to the hospital.