Shoulder creaking when the arm moves may be physiological popping, or it may be caused by frozen shoulder, bone fracture, osteoarthritis and other pathological factors. 1. Physiological rattling: when the human body is in a static state and suddenly carries out extension and flexion activities, pressure friction will be generated between the articular cartilage, tendons and synovial fluid, which will produce a crisp rattling sound. This phenomenon is normal physiological rattling of the joints, which is usually not accompanied by pain and other uncomfortable symptoms. 2. Periarthritis: when suffering from periarthritis, due to the destruction of the joint capsule, tendon hyperplasia and other factors, the soft tissues around the shoulder joint will be pulled during arm activities, which will cause friction of intra-articular tissues and the creaking sound, accompanied by pain and activity disorder of the shoulder joint. 3. Fracture: If there is a fracture around the shoulder joint, the joint surface will be damaged and the joint will be unstable, and the creaking sound of the shoulder will occur when you move your arm. 4. Osteoarthritis: Due to various factors destroying the cartilage cells around the shoulder joint, secondary osteophytes, etc., pain or bony friction can occur around the shoulder joint, which leads to creaking sound. Caused by arm movement shoulder creaking more reasons, may also be associated with rotator cuff injury, shoulder dislocation and other reasons, if the symptoms continue without relief, it is recommended to promptly go to the hospital to find out the cause of the disease, and then targeted treatment.