Whether a tendon injury can heal on its own depends on the extent of the specific injury. If the strain is mild, it can usually heal on its own. When a tendon injury occurs in a certain part of the body, if the joint movement of the injured tendon is not affected, the local swelling is not very strong, and there is no obvious bruising, it means that the tendon injury is relatively mild, and the injury may heal on its own after a period of rest. If the joint movement of the tendon injury is affected and the swelling is heavy, it means that the injury is more serious, so it is necessary to go to the orthopedic department of the hospital immediately and follow the medical advice to fix the tendon with a brace or cast. Tendon injury should pay attention to rest, diet can be appropriate to eat more high-protein food, such as milk, lean meat, etc., to help the repair of the tendon.