Tendonitis of the arm can be treated by general treatment, physical therapy, drugs, surgery and other methods. 1. General treatment: tendonitis is mainly caused by strain, so we should pay attention to rest in normal times and avoid frequent extension and flexion of joints. If necessary, braking can be done to make the joints get enough rest. 2. Physical therapy: such as cold therapy, heat therapy, baking electricity, etc. Physical therapy can improve the circulation, reduce the inflammatory reaction, relieve the symptoms of swelling and pain. 3. Medication: Commonly used non-steroidal anti-inflammatory drugs, such as diclofenac sodium, can play a role in anti-inflammatory and pain relief. It can also be closed with trimethoprim and lidocaine, which can also improve the symptoms and promote recovery. 4. Surgery: If the symptoms are serious or recurring, after conservative treatment is ineffective, you can choose surgical treatment, such as lesion cleaning surgery. Tendonitis of the arm should go to the hospital in time for further diagnosis and treatment. The above drugs need to be applied under the guidance of a physician to avoid self-medication.