For patients with sudden pain in the hamstrings, this condition: 1, acute strain injury to the tendons, ligaments and fascia of the foot can lead to sudden pain in the hamstring area, thus affecting the normal weight-bearing activities of the foot; and after the injury is serious, it can lead to significant swelling and bruising of the foot. 2, seen in middle-aged and elderly people with degeneration and hyperplasia of the bones of the foot. This condition can also lead to prolonged walking after the proliferation of bone irritation of the surrounding soft tissues, thus causing soft tissue swelling. In this case, when resting, the patient will feel a sudden symptom of hamstring pain. 3, seen in the foot fatigue fracture, this situation is related to prolonged, repeated walking activities, which will lead to repeated stress and strain on the bones of the foot, causing fatigue fracture, this situation will also lead to the patient has obvious pain symptoms in the hamstring area.