A noticeable rattle in the pelvis while walking is most likely due to a snapping hip. A normal physiological snapping hip occurs at a specific angle of hip movement and does not usually occur when walking and does not cause any discomfort. However, there is a pathological type of snapping hip that occurs with every step when walking, mainly because the tendon membrane around the hip joint slides significantly when walking near the femoral head. During the sliding process, the tendon membrane is in a relatively tense state, and once it crosses the surrounding bone structure, it will emit a noticeable popping sound, and after the popping sound, it will be accompanied by localized soreness, resulting in the leg not being able to walk quickly. If the hip is pathologically rattling, it should be treated conservatively, with local physiotherapy and hot compresses, and with other blood-boosting drugs.