The tendon pain inside the shoulder usually refers to the pain caused by muscles, fascia or joints, which may be caused by physiological factors or by certain diseases, such as muscle strain, fasciitis, frozen shoulder, etc.. Commonly used treatments include general treatment, drug treatment and surgery. 1. Physiological factors: prolonged and strenuous exercise of the shoulder can lead to accumulation of lactic acid in the shoulder and symptoms of shoulder pain. Prolonged bowing of the head and sitting in an improper posture may also lead to muscle irritation and pain. Generally, no treatment is needed, and the pain can be relieved after resting. Appropriate massage and hot compresses can also be used to promote blood circulation and help recovery. 2. Muscle strain: improper shoulder movement or strenuous exercise may lead to shoulder muscle strain, resulting in pain in the tendons inside the shoulder. 2. Fasciitis: Shoulder trauma and strain may lead to aseptic inflammation of the fascia, causing pain. You can use non-steroidal anti-inflammatory drugs such as ibuprofen to relieve the pain, and use eperisone hydrochloride to improve muscle tension. In general, it is important to reduce the strenuous activities of the shoulder and avoid maintaining a fixed position for a long time. Fascial release can be used to improve the symptoms if conservative treatment is not effective. 3. Frozen shoulder: Inflammation of the shoulder joint and the surrounding soft tissues will often cause shoulder pain, which may be accompanied by activity limitation. The use of non-steroidal anti-inflammatory drugs such as ibuprofen can effectively relieve pain, and in severe cases, the symptoms can be relieved by local injection of glucocorticoids or local anesthetics. Usually, activities such as shaking and circling can be used. The tendon pain inside the shoulder may also be caused by cervical spondylosis, etc. It is recommended that the patient consult a doctor in a timely manner, improve the relevant examination under the guidance of the doctor, and comply with the doctor’s instructions for treatment.