How long it takes for local soft tissue swelling to heal after a foot sprain cannot be generalized, and the specific cause of the swelling needs to be identified before it can be evaluated. Usually, local soft tissue swelling and bruising occur after a foot sprain, which may be caused by two different reasons, one is a simple soft tissue injury, and the other is a combined fracture injury. Relatively speaking, the former is lighter and the latter is heavier, and the recovery is naturally faster in the former and slower in the latter, but generally can be fully recovered within 3 months. In particular, swelling caused by a simple soft tissue injury can be gradually reduced after 3-7 days. If after 1 week the patient still has significant pain and the swelling disappears insignificantly, it is recommended to visit the orthopedic department of the hospital as soon as possible and have an X-ray or CT examination to rule out the presence of other problems such as fractures. In addition, the patient can elevate the affected area after foot sprain, pay more attention to rest, eat a light diet and avoid eating spicy and stimulating food, etc.