There are many reasons for femoral pain, the most common of which are the following: 1, if the pain occurs after trauma to the hip, it is considered to be caused by fracture of the diaphysis, femoral neck fracture, usually accompanied by limitation of lower limb activities or obstacles, if the lower limb activities are normal, it may also be due to the pain caused by soft tissue injury to the buttock muscles. 2, if there is a history of previous trauma, long-term alcohol abuse, and long-term hormone history, it should be considered to be caused by femoral head necrosis. 3, if there is obvious redness, swelling, heat, pain with high fever symptoms, it should be considered to be caused by bacterial infection resulting in osteomyelitis, causing pain. If there is a history of previous trauma, long-term alcohol abuse and long-term hormone use, it is necessary to consider that the pain is caused by osteonecrosis of the femoral head.3. If there is obvious redness, swelling, heat and pain localized in the thigh accompanied by high fever, it is necessary to consider that the pain is caused by osteomyelitis due to bacterial infection.4. If there is pain in the femoral area, there is a history of Mycobacterium tuberculosis infection, and accompanied by a persistent low state, it is necessary to exclude bone tuberculosis.