Hip pain may be a simple joint lesion or a local manifestation of a systemic disease. Its acute arthralgia is based on the inflammatory reaction of the joint and its surrounding tissues, while chronic arthralgia is based on osteophytes and so on. The main causes are as follows: 1. Trauma: including acute injuries and chronic injuries. Acute injuries are caused by external forces that damage joint bones, muscles, ligaments and other tissues, resulting in joint dislocation or fracture, making the joint swollen and painful; chronic injuries are often due to excessive joint activity, long-term weight bearing or poor healing after acute injury, resulting in damage to joint cartilage and joint surface, and damage to the tissue surrounding the joint. Such as hip fracture, dislocation, femoral head slippage, etc. 2, infection: trauma, soft tissue inflammation near the joint, etc. can lead to infectious arthritis. Due to the deeper location of the hip joint redness and swelling will not be obvious. Such as hip joint infection, rheumatoid arthritis, etc. 3, degenerative disease: joint surface due to greater weight bearing, long-term excessive friction or trauma will lead to the formation of bone redundancy at the edge of the bone and joint, and then pain and limited activity. 4, allergic reactions and autoimmunity: specific autoimmunity mainly invades blood vessels and connective tissues throughout the body, the emergence of diseases collectively known as rheumatic diseases, joint lesions will be one of the systemic damage. 5, metabolic bone disease: such as vitamin D metabolism disorders caused by osteochondrosis osteoarthropathy, etc., can cause joint pain. There are various causes of hip pain, and only the identification of different types of diseases will have practical significance for the selection of treatment and prognosis.