Femoral head necrosis is the loss of blood supply and necrosis of the femoral head, which often occurs after the use of hormones, excessive alcohol consumption and fracture dislocation, but also occurs in some patients without obvious causes. Osteonecrosis can occur at any age, mostly between 30 and 50 years old, and is relatively common in men. It often starts without obvious symptoms and delays diagnosis and treatment, and further development can lead to dysfunction of the hip joint, seriously affecting the patient’s quality of life and ability to work. How can I know if osteonecrosis of the femoral head has occurred? First of all, you should understand that the incidence of femoral head necrosis in China is not as high as you think. Many patients have misconceptions about it and blindly guess that necrosis has occurred once they experience pain and discomfort in the hip joint. Secondly, some doctors do not know enough about the disease of femoral head necrosis and often diagnose other hip diseases as necrosis in a general way, which makes the treatment difficult. Also, certain hip diseases, such as osteoarthritis, rheumatoid arthritis, infectious diseases, congenital hip dysplasia (dislocation), synovial diseases, etc., in the advanced stage of these diseases, the blood supply to the femoral head is severely damaged and most of them are complicated by femoral head necrosis, which is essentially different from the primary femoral head necrosis. It is also very important to note that both femoral head necrosis and other hip diseases will cause dysfunction and disability at a certain stage of development, so it is not the case that femoral head necrosis is more serious than other hip diseases, and both should receive regular and effective treatment. Therefore, if you experience pain or discomfort around your hip joint, inner thigh, anterior side or knee, or weakness in one lower limb, please visit a regular hospital immediately to further diagnose your exact disease and receive timely and effective treatment.