Left hip pain may be caused by the following reasons: 1, necrosis of the femoral head can appear hip pain, especially in walking, weight-bearing pain is more obvious, commonly found in patients who have been drinking alcohol for a long time and have used hormones, and then we should carry out nuclear magnetic and CT examinations of the femoral head to diagnose. 2, impingement syndrome, often due to the acetabulum and the femoral neck impingement on each other, resulting in the glenoid labral tear, which leads to the appearance of the hip pain, often a palm-sized pain in front of the hip, the pain is obvious when squatting or walking. 3, tuberculosis or bacterial infection of the hip joint causes pain. 4, tumors cause pain, such as tumors of the femoral neck cause pain. The pain is often the size of a palm in front of the hip, and the pain is obvious when squatting or walking.3. Pain caused by tuberculosis or bacterial infection of the hip joint.4. Pain caused by tumor, such as pain caused by the tumor of the femoral neck.