First, it is important to distinguish the severity of the injury.
If the back of the foot can stand after the sprain, barely walking, indicating that the sprain is mild; if the back of the foot after the sprain when the activity has increased pain, can not stand or move, pressure pain in the bone and gradually swollen, indicating that a fracture may have occurred, should immediately go to the hospital film diagnosis and treatment.
Within the first 24 hours of the sprain, cold compresses should be chosen, and after 24 hours have passed, hot compresses can be used.