Hypertension can cause damage to kidney function and can produce proteinuria, and increased protein can easily lead to water and sodium retention causing edema. High blood pressure, if poorly controlled for a long time, will gradually lead to heart failure, and heart failure itself will also lead to edema in the lower limbs of patients. In addition to the above two aspects, some hypertensive patients gradually develop lower limb atherosclerosis occlusion, which will also lead to leg swelling, so hypertension will indirectly lead to lower limb edema. Some hypertensive patients may take special drugs, so lower limb edema, such as calcium channel blockers, representative drugs are amlodipine, felodipine, edema will generally be improved after stopping the drug, or oral diuretics while taking this type of drugs, accordingly there will be some improvement.