Hip popping is categorized into physiological popping and pathological hip popping. Physiological snapping is mainly caused by the air in the hip joint being squeezed; while pathological snapping may be related to the tension of the muscle groups around the hip joint, hip joint injury, necrosis of the femoral head and other factors. 1. Physiological snapping: it is mainly caused by the extrusion of air in the hip joint. It is manifested as abnormal sound from the hip joint during activities, but usually not accompanied by pain, soreness and other uncomfortable symptoms. 2. Muscle group tension: may be caused by strain, cold, trauma and other factors. When the hip joint is flexed, adducted or rotated, the thickened posterior border of the iliotibial bundle and the anterior fibers of the gluteus medius muscle rub against the protruding portion of the greater trochanter of the femur and make a popping sound. Sometimes a thick striated band can be seen slipping through the greater trochanter. 3. Hip joint injury: when the hip joint is traumatized, resulting in ligament or glenoid injury in the hip joint, local cartilage damage and other abnormalities, when the hip joint is moved again, there will be obvious rattling, pain, limited activities and other symptoms. For patients with snapping hip, they should first determine whether the snapping is physiological or pathological. For patients with pathologic snapping hip, it is recommended to go to the hospital in time to improve the physical examination, MRI and other related examinations, and carry out the follow-up targeted treatment under the guidance of specialists.