If there is a bone or joint injury, such as a fracture or joint dislocation, after a smash to the back of the foot, there is usually severe pain and a large hematoma, and the patient loses weight-bearing capacity and the ability to move and exercise the affected foot. In addition, there are some mild or inconspicuous fractures that are not visible or detectable in the early stages, and only become apparent after the patient has had some time to exercise and walk after the injury. Therefore, it is recommended to go to the hospital for a foot x-ray to observe the more severe pain, and if there is a fracture, internal fixation should be done in time, and a cast should be applied to restrict the activity for a long time to reconstruct the bone. If there is only soft tissue damage and bruising on the back of the foot, you can soak your feet in hot water and apply some bruising medication to reduce swelling and pain.