In view of the fact that femoral head necrosis is a highly difficult disease, and most of the early stage without typical symptoms, to the early diagnosis of the arrival of difficulties, and once the clinical easily diagnosed, the condition is mostly in the late stage, delaying treatment, so when the following symptoms should be examined to exclude the femoral head necrosis and other hip diseases. If you have had hip injury before, such as hip dislocation fracture or serious soft tissue injury, and after several years of treatment and rehabilitation, the pain symptoms are not removed or the symptoms are eliminated for several years, and then the pain and discomfort appear for no reason, you should consider the possibility of traumatic femoral head necrosis. In the case of femoral neck fracture, for example, although the fracture has been treated with internal fixation and has healed on several films, there is a possibility of femoral head necrosis within 5 years. Therefore, for this kind of fracture, it should be reviewed regularly within 5 years after surgery. Of course, a general X-ray is sufficient. Second, young and strong men, usually addicted to alcohol, in the absence of other clear reasons, hip pain, can be in the root of the thigh (groin), can be in the back side of the buttocks, after rest or symptomatic treatment symptoms continue for a month without relief, should be highly suspected of alcohol-induced necrosis of the femoral head. In addition, if the hip joint moves freely, and then it appears that it cannot cross-legged, the degree of suspicion is even greater. If you have a history of high uric acid or gout, you need to check whether the hip pain is caused by gouty arthritis or femoral head necrosis, or both. For those who have hip pain for a short period of time, MRI is the most sensible examination, and rarely misses the diagnosis. Third, for people with immune diseases such as rheumatoid arthritis and lupus erythematosus, especially those who have received or are taking glucocorticoids, these diseases can cause joint pain, so they are easily overlooked. Of course, hormonal osteonecrosis should be thought of when there is an incredible increase in hip pain during the course of treatment. The diagnosis can be confirmed with an X-ray. For a small number of people, who are usually healthy, the unexplained hip pain appears unknowingly and is diagnosed as osteonecrosis of the femur after examination. Fourth, for young adults, especially women, low back pain or hip pain, rest to reduce, exertion to aggravate, the film will find the existence of acetabular dysplasia, the degree varies from person to person, the history of less than a few months, heavy decades, the clinical easy to be diagnosed as femoral head necrosis, in fact, because the acetabular dysplasia caused by osteoarthritis. Fifth, elderly women, in the absence of obvious trauma in the case of unexplained hip pain, family members should pay sufficient attention, because osteoporosis can cause potential pathological fractures, and mostly occur in elderly women are easy to ignore, at this age there is usually this pain that pain, family members are easy to ignore. It is important to understand that if osteoporosis develops to a certain extent, even a slight flash or normal daily life can cause a fracture of the femoral neck. In another case, an elderly person who fell and got up and could walk thought that there was no problem, but the symptoms did not go away after a few days, and even walking became heavier and heavier, and a fracture of the femoral neck or pubic sciatic bone was found in the hospital. Hip pain can be caused by many diseases, the above are more serious diseases, there are many less serious diseases can cause persistent hip pain, such as muscle fibrosis, subtrochanteric bursitis, pear-shaped muscle syndrome, popping hip, impingement syndrome, etc., sometimes even to the hospital for examination can not determine what the disease. However, the necessary imaging, although it costs money, even if no major disease is found, should be happy, after all, those diseases are not easily cured by simple drugs. There are many diseases that develop slowly, are atypical in the early stages, and the pathological process is not terminated by clinical treatment. For the clinician, early diagnosis means a chance of recovery.