Swelling of the feet has physiological and pathological factors, local and systemic factors. The main causes of clinical common are the following aspects: 1, long time standing or walking for a long time, it may also be a long time to keep sitting position, poor blood circulation in the lower limbs, caused by swelling of the feet. Generally after rest symptoms can be relieved, belong to the physiological factors. If the symptoms are not easily relieved after rest, we should consider the possibility of varicose veins in the lower limbs or deep vein thrombosis and other pathologic factors.2. Swelling of the feet may also be due to systemic diseases caused by swelling of the feet, such as cardiac dysfunction, heart failure, liver and kidney dysfunction. Diabetic patients with end-stage peripheral vascular neuropathy may also experience swelling of the feet.3. Foot trauma or sprain factors lead to ankle injuries, local blood circulation disorders, the symptoms of swelling of the feet.