Humerus tuberosity capsulitis is not arthritis. Capsular degeneration of the greater tuberosity of the humerus is usually caused by impingement of the acromion with the greater tuberosity of the humerus due to a developmental deformity of the acromion, and in some cases there is a combination of rotator cuff injuries. Some humeral head capsulitis is caused by ischemic necrosis of the humeral head, and in severe cases, it can lead to collapse and deformation of the humeral tuberosity. Mild capsular changes usually have no discomfort, while severe patients may have shoulder pain and limited arm lifting. Arthritis is caused by degeneration of the joints, which is generally characterized by joint hyperplasia, narrowing of the joint space, and localized osteosclerosis, and can be clearly diagnosed by taking X-rays. Therefore, the capsular lesion of the humerus tubercle is not arthritis. It is recommended to go to the hospital specialist for further examination and treatment.