Joint ringing is also called joint popping, causing this phenomenon for the following reasons: a, physiological factors When the body is in a fixed position for a long time after the resting state, sudden stretching or flexion and extension of the joint, often emitting a crisp, single, painless ringing, is a normal phenomenon. This situation through moderate activity, avoid maintaining the same position for a long time can alleviate the occurrence of symptoms. Second, pathological factors 1, arthritis: joint local cold can induce synovial inflammation in the joint, the joint can appear when the activity of friction, resulting in the joint popping situation. In addition, osteoarthritis, such as joint osteophytes, due to the narrowing of the joint space, free body friction in the joint activities can also lead to joint popping; 2, joint injury: joint capsule ligament injury, knee meniscus injury can occur in the joint popping, usually dull sound, can be accompanied by pain strangulation symptoms; 3, joint degeneration: usually due to joint cartilage degeneration, or joint surrounding muscles, ligaments Relaxation of the muscles and ligaments around the joints, joint popping sounds often occur when moving, suggesting wear and tear or strain on the cartilage, mostly in the elderly. Attention should be paid to strengthening physical exercise, reducing sitting and lying time, so that the muscles are strong and the joints are stable.