Fatigue fractures, also called stress fractures, are also called marching fractures because they are commonly seen in military recruits on long marches. Certain relatively delicate parts of the bone or parts with large changes in bone structure morphology are prone to stress concentrations, and when subjected to long periods of repeated minor injury forces, trabecular fractures occur first and are then repaired. However, if the repair process continues to be subjected to external forces, which obstruct the repair and increase bone resorption, it may lead to complete fracture because bone resorption is greater than bone repair. The main clinical manifestations are: 1. gradually increasing pain at the injury site, which is especially obvious during or at the end of training; 2. local pressure pain and mild bony elevation on physical examination, but no abnormal activity, a few can be seen local soft tissue swelling; 3. X-ray film is often no obvious abnormality within 1-2 weeks of the appearance of symptoms, after 3-4 weeks, a transverse fracture line can be seen, surrounded by bone crust formation, long duration of the disease The fracture line is clearer, and the fracture end has whitening and sclerotic signs. Therefore, when a fatigue fracture is clinically suspected and the X-ray examination is negative, the early diagnosis is made by radionuclide bone imaging. The treatment of fatigue fractures is the same as that of violent fractures. It should be noted that fatigue fractures that are diagnosed late are more difficult to heal because of the sclerosis of the fracture end. Specific recommendations are as follows: 1. Avoid eating hot and unfresh food; 2. Avoid taking hormonal drugs in particular; 3. Pay attention to a nutritious, balanced and comprehensive diet, with appropriate supplementation of vitamin D and calcium intake; 4. Exercise according to their own physique to grasp the amount of exercise and exercise essentials, fully prepared activities; 5. Pay attention to exercise methods, step by step; 6. Pay attention to rest in general, should not be too much activity and bending 7, before engaging in difficult sports, it is best to receive sports medical advice, learn some general knowledge of sports physiological health; 8, ready to wear sports clothing, wear flexible sports shoes, avoid running and jumping sports in too hard ground.