The body is largely made up of soft tissues including muscles, tendons, ligaments and fascia. When any of these soft tissues are injured through the cumulative injury cycle, or through direct trauma such as spraining an ankle, the tissues repair themselves in a randomised fashion. This causes scar tissue to develop in the area, and may lead to pain and chronic injury.
While scar tissue itself does not cause any pain, it restricts the range of motion and stops nerves from sliding correctly, and the resultant stiffness often contributes to persistent pain. The pain can range from mild and irritating to severely debilitating and requires effective treatment to heal properly.