A hamstring injury occurs when 1 or more of the 3 hamstring muscles or tendons (a type of soft tissue connecting the muscle to the bone) tear. It is 1 of the most common injuries of the lower body, particularly affecting athletes participating in sports such as football, soccer, or track. After tearing a hamstring muscle, a person is 2 to 6 times more likely to suffer a subsequent injury. Surgery is required to treat the most severe cases. However, in most cases, hamstring injuries are managed with physical therapy.