Swelling of the feet after walking for a long time is commonly caused by the following reasons: First, the patient usually seldom participates in activities and has a serious lack of muscle strength, and the muscles become fatigued after walking for a long time and are unable to play the role of muscle pump, thus causing bruising of the feet and thus edema. Second, varicose veins in the lower extremities, serious obstruction of venous return, also easy to lead to venous stasis in the feet, thus inducing swelling symptoms in the feet, the symptoms are more obvious when walking for a long time. Third, lower limb diseases, such as osteoarthritis and fracture of the lower limbs, can cause severe secondary muscle atrophy, thus causing functional edema of the limbs. Fourth, medical diseases, such as heart failure, renal insufficiency, and hypoproteinemia, can also cause patients to walk for long periods of time and have symptoms of swollen feet.