As the saying goes, if you know your enemy, you know your enemy. Runners should learn to identify the relationship between injury and disease, distinguish between general injuries and more serious injuries, and help doctors find the root of the problem. It is absolutely essential for athletes to be able to distinguish their own level of injury. Even in cases where the cause of injury is similar, the level of injury is very different depending on the external environment and the individual’s ability. Therefore, it is a misconception that it is inaccurate to rely on “similar situations” or “I have encountered this situation before” to determine the degree of injury. General injury and its relationship to the disease The basic characteristics of injury and disease soft tissue injury. It mainly includes muscle, tendon, ligament injury. Muscle is the power source of human movement. Muscle injuries generally arise from the contraction of the muscle and being stretched, depending on the degree of strain, the muscle itself reacts differently, and generally the patient is more capable of self-protection, because the muscle is painful and can not send up the force. Tendon and ligament strains are also very common, to be divided into first, second and third degree once for minor strains, second degree for general fiber damage, third degree for complete fiber tears. The distinction between first, second and third degree can be judged by redness, swelling and pain, mobility, joint stability and joint strength. First degree strains are painful with movement. Second-degree strain, pain is not easy to get relief through the so-called activity open, may also be accompanied by a loose joint; third-degree strain, the joint is completely loose and tension, while the acute injury is generally accompanied by stabbing pain, easy to hit the leg when the force; bone injury. Generally cartilage damage on the bone surface, avulsion fractures, simple fractures and complex fractures, some fractures are relatively stable while others are completely unstable and cannot continue movement. Bone fractures occur mainly in the cartilage beneath the bone one by one in the meniscus of the knee joint, the glenoid labrum of the shoulder joint, and the triangular cartilage area of the wrist joint. The degree of pain can be determined by distinguishing the nature of the pain to determine the extent of the injury and the level of recovery, but some pain is felt differently by the runner. Muscle pain tends to range from tingling in the early stages to tugging soreness and swelling in the later stages. Bone pain, on the other hand, is different in nature, intensity, location, and depth from tendon, ligament, and muscle; it is often an unbearable, drilling pain and does not lessen with adequate preparation activities. Each person has the most direct feelings about the nature of pain, the degree of pain, and the pattern of change in the injured area during and after the injury, which is first-hand information and an effective basis for surgeons and experienced sports medicine and rehabilitation professionals to judge. Runners want to run farther and longer should spend some time to understand their own body, to understand some common running injury knowledge, in order to help themselves prevent running injuries, once there are injuries, can also effectively help doctors timely and accurate diagnosis and early cure to return to running life.