Bones ringing when shaking the arm may be caused by the following reasons: First, it may be caused by the presence of joint inflammation in the upper limb. For example, if there is frozen shoulder or traumatic arthritis of the elbow joint in the upper extremity, there may be abnormal activity inside the joint or abnormal friction during the patient’s arm shaking process, which leads to the bones ringing. Second, it may be caused by tendinopathy of the upper limb. For example, stenosing tenosynovitis, tendon sheath cysts, or inflammation of the tendon stop in the upper extremity. In the process of the patient shaking the arm, there will be abnormal activity of the tendon. At this time, because the tendon is relatively close to the bone, it will make the patient mistakenly think that it is a bone ringing. Third, it may be caused by old injury. For example, if the patient has had old fractures in the upper limb in the past, in the process of recovery, there will be excessive local osteophytes, or there is an injury calcification of the surrounding soft tissue. At this time, the activity of the upper limb will cause a strange sound in the area. Fourth, it may be caused by the instability of the joints of the upper limbs. The patient has produced ligamentous laxity around the joint due to genetic factors, and in the process of the patient shaking the arm, there may be abnormal activity of the joint, resulting in abnormal sound.