Rattling joints are commonly caused by joint inflammation and congenital joint instability, as follows: First, joint inflammation: most degenerative osteoarthritis, patients will have damage to joint cartilage, and frictional sounds will occur during joint activities, accompanied by joint pain and limited joint movement, which is common in elderly patients. Second, congenital joint instability: due to developmental causes of joint capsule laxity, as well as ligamentous laxity, the patient’s joint surface will have repeated excessive wear and tear, which will also lead to joint ringing, the patient does not have obvious pain and activity restrictions in the early stage. Third, the presence of free body or meniscus damage: both will affect the joint flexion and extension activities, resulting in joint ringing, accompanied by pain and limited movement. After active consultation, the cause of the joint ringing can be clarified and the symptoms can be removed through timely treatment.