Left hip pain may have the following causes: First, osteonecrosis of the femoral head, osteonecrosis of the femoral head can occur when the hip joint pain is very obvious when bearing weight, often with a history of smoking, alcohol abuse and long-term use of hormones. Second, osteoarthritis of the hip joint, the elderly with the age of degeneration of the hip joint may appear osteoarthritis and lead to joint pain. Third, hip impingement syndrome, hip impingement syndrome can be for the acetabulum and femoral neck direct impact with each other, can also be for the femur and the sciatic bone impact with each other to appear obvious pain in the hip, and at the same time can be accompanied by lower limb limb numbness, discomfort. Fourth, various causes of synovitis, such as rheumatism, rheumatoid or brucellosis infection resulting in hip pain, can also be the joint pain caused by tuberculosis. Therefore, if hip pain persists without relief, it is necessary to go to the hospital for early consultation and treatment.