The feet are always swollen for the following common reasons: First, orthopedic diseases, such as severe lack of muscle strength in the lower limbs, the occurrence of lower limb fractures, knee, hip and ankle diseases, resulting in patients walking too much distance, can cause swelling symptoms in the feet. After active rehabilitation training and treatment of the primary lesion, the swelling of the foot can be gradually relieved or even disappear completely. Second, internal diseases, such as severe heart failure, kidney failure, hypoproteinemia and chronic anemia, can lead to frequent swelling symptoms in the lower limbs, especially the feet. Treatment of the primary disease, such as heart failure, kidney failure, anemia, and hypoproteinemia, will cause the swollen foot symptoms to disappear completely. However, since such medical conditions can be repeatedly aggravated, foot swelling symptoms can also occur frequently.