Hip popping may be caused by external trauma, soft tissue proliferation, hip dislocation and other factors. 1. External trauma: Due to trauma or prolonged strain on the hip joint, the local soft tissue becomes congested and edematous, resulting in the proliferation of fibrous tissue in the body. When the hip joint is flexed, it can lead to hip popping. 2. Soft tissue hyperplasia: If the patient is injected repeatedly in childhood, it will lead to local contracture and soft tissue hyperplasia. In the process of bending or extending the leg, it can lead to the part of soft tissue hyperplasia, sliding on the large thick rump, thus causing the hip joint popping. 3. Hip dislocation: When the hip joint is hit by a car accident, the hip joint will be dislocated. The failure to seek timely medical treatment leads to the collision of articular cartilage, inducing the phenomenon of hip joint popping. It is recommended to exclude physiological causes of hip popping, timely medical treatment for a comprehensive examination, so as not to delay the treatment time.