Femur pain should be alert to bone tumor, bone infection, bursitis, hip joint lesions such as acetabular impingement syndrome, femoral head necrosis and osteoarthritis of the hip joint, etc.; if it is overexertion, it may also be physiological factors, which manifests as transient pain. 1. Bone tumor lesions: such as osteosarcoma, osteoid osteoma, chondrosarcoma, giant cell tumor of bone, etc., usually with typical X-ray manifestations, pain is obvious at night, combined with pathological examination and corresponding auxiliary examination can be clear. 2. Bone infection lesions: such as purulent osteomyelitis or femoral tuberculosis, etc., usually accompanied by local redness, swelling, etc., and some of them have sinus tracts. 3. Bursitis of the greater trochanter: the pain is located at the lateral greater trochanter of the upper end of the femur, and the pressure pain there is more obvious. 4. Hip joint lesions: such as femoral head necrosis, hip impingement syndrome, hip osteoarthritis, etc., the pain is usually aggravated after the joint is loaded and stressed, and it can be clearly diagnosed through X-ray film and MRI examination. If the femoral pain is transient, it cannot be ruled out that it is caused by physiological factors such as lactic acid accumulation caused by excessive strain, etc. If the pain is recurring and getting worse, it is recommended to go to the hospital in time for diagnosis and treatment.