Thumb with shoulder tendon pain may be related to radicular cervical spondylosis, tendon injury, radial tuberosity stenosing tenosynovitis and other factors. 1. Neurogenic cervical spondylosis: It is a kind of nerve root lesion caused by cervical degeneration, and one of its typical clinical manifestations is radiating pain or numbness in the upper limbs. The symptom is characteristic and has a lot to do with the patient’s neck position and posture, so it is possible to have the symptom of thumb with shoulder tendon pain. 2. Tendon injury: when injury to the bunion tendon occurs in the course of sports, it may lead to the symptom of pain in the tendon of the thumb attached to the shoulder, and there may also be the symptom of restricted movement of the wrist joints and restricted movement of the thumb. The area where the tendon was injured will be visibly swollen, and the pain will be aggravated when pressure is applied. 3. Stenosing tenosynovitis of the radial tuberosity: this disease is mainly manifested as pain in a tendon of the thumb attached to the shoulder, and the pain will be aggravated when the thumb is straightened. When the symptoms of thumb with shoulder tendon pain appear, you should go to the regular hospital in time, under the guidance of professional doctors to clarify the cause and treatment.