Biceps tendonitis mainly occurs in the superior glenoid tuberosity of the scapula, and once it develops, it can produce shoulder pain, joint stiffness and other discomforts. 1. Shoulder pain: the biceps tendon does not produce tenderness in normal people, but if it is strained for a long period of time, it will increase the burden on the shoulder, and for this reason, when pressing the joint or the vicinity of the joint, it will produce obvious tenderness, and in severe cases, it will not be able to move normally. 2. Joint stiffness: Since tendon is a very important fibrous tissue connecting muscle and bone, therefore, after inflammation, its movement will be limited, resulting in joint stiffness. Biceps tendonitis is extremely bad for health, once the above performance should quickly go to the hospital for a comprehensive examination, followed by targeted treatment.