There are many causes of swollen feet, mainly divided into physiological and pathological causes, the common ones include: 1, weight loss, anorexia, resulting in eating less protein deficiency in the body caused by swollen feet. 2, work or other reasons for prolonged standing, walking, sitting and standing caused by swollen feet. 3, the weather temperature is too hot, the rise in temperature will lead to the expansion of human blood vessels, capillary congestion, subcutaneous muscle soft tissue swelling. 4.Medications, especially the elderly because of daily medication, such as antihypertensive drugs, insulin drugs, etc. will lead to abnormal swelling of the hands and feet. 5.Patients with venous thrombosis of the lower extremities, especially in the long-term bedridden population, slowed blood flow will lead to significant swelling of the distal limbs. 6.Kidney disease, such as nephritis sodium retention will cause swelling of the feet. 7.Patients with cirrhosis of the liver, hypoproteinemia will appear feet Obvious swelling. 8, Heart failure can lead to impaired venous return can also cause swollen feet.