Foot fracture refers to ankle fracture, five and a half months after the fracture is still swollen may be due to lower extremity venous thrombosis, delayed healing of fracture, premature activity, infection and so on. 1. Lower extremity venous thrombosis: because of the role of violence in the lower extremity blood vessel wall damage or lack of activity in the lower extremity after the fracture, may lead to abnormal blood agglutination, the formation of venous thrombosis in the lower extremity, causing venous return obstacles, thus appearing foot and ankle swelling. 2. Delayed healing of fracture: If the fracture injury is heavy, nutritional status is poor, long-term bed rest, resulting in delayed healing of the fracture, there will also be persistent swelling of the ankle. 3. Premature activity: If you don’t have enough rest after the fracture of ankle, and the fracture is not basically healed before you go down to the ground for activity, which will cause the fracture end to be displaced, and secondary injury will occur, and the foot will also appear to be swollen. 4. Infection: If the fracture is combined with an open injury and infection occurs or the surgical port is contaminated after surgery, persistent swelling, fever, pain and other symptoms of the ankle can occur. Five and a half months after the fracture of the ankle is still swollen for a variety of reasons, it is recommended to consult a doctor in a timely manner to clarify the cause of the disease, targeted treatment.