Foot sprain forty days has not been well, should first identify the cause, and then choose the appropriate treatment, common causes are soft tissue injury, ligament rupture, fracture, etc., the treatment includes general treatment, physical therapy, surgical treatment and so on. 1. Soft tissue injury: due to poor blood circulation around the ankle joint, the recovery time is long. At this time, bed rest, local hot compresses, massage, baking electricity, etc.. 2. Ligament rupture: for ankle ligament rupture, ice compress, brake, brace protection, etc.; choose local physical therapy, etc.; more serious tear needs surgery. 3. Fracture: ankle fracture, if it is a mild fracture, you can use plaster or support fixed, such as the fracture end of the obvious displacement, the need for surgical treatment. Cause foot sprain forty days is not good, there may be other reasons, it is recommended to go to the hospital in time, under the guidance of the doctor for standardized treatment.