There are two types of foot swelling, some people have unilateral swelling and some people have bilateral lower extremity swelling, and these two are not the same. If the swelling is unilateral, it is often related to the vascular and local conditions at the time. In particular, if a patient is bedridden for a long time and has swollen feet on one side, such as the left or the right side, it is necessary to pay attention to the combination of pain and swelling, especially if there is a problem with the venous system, it is best to go to the hospital to do ultrasound to see the vascular condition of the lower limbs, and if there is a blockage of the blood vessels or venous thrombosis, it is necessary to go to a specialized hospital for treatment such as thrombolytic therapy, embolism treatment or antiplatelet and anticoagulant drugs. If the swelling is in both lower limbs, it may be related to systemic conditions such as poor heart function and patients who take calcium antagonists for years to lower blood pressure, and sometimes ankle edema may occur. In women, edema can also occur at physiological age and during the reproductive or physiological cycle.