Groin popping can be caused by vitamin D deficiency, prolonged posturing, and repeated hip flexion. 1. Lack of vitamin D: Lack of vitamin D will lead to poor absorption of calcium, osteoporosis and bone dysplasia, resulting in groin popping. 2. Prolonged retention of a position: prolonged retention of a position will lead to localized synovial membrane embedded in the change of position will lead to the gas within the joints are extruded, resulting in bubbles, groin popping sound. 3. Repeated hip flexion: If the patient’s hip is flexed, it will easily lead to slippage in the deep bone structure in the groin area, and groin popping will occur. There are many other reasons for groin popping, so it is recommended that patients go to the hospital for timely examination and treatment, and always observe their physical condition.