Arm pain, not red or swollen is painful phenomenon, may be caused by cold, in addition to the more common clinical causes of upper limb neuromuscular or joint, ligament lesions, such as tenosynovitis, synovitis, tennis elbow, etc.: 1, cold: when the arm is cold, due to blood and Qi does not work and cause arm pain phenomenon. After the cold, the local blood circulation is not good, resulting in the body’s metabolic products, such as lactic acid can not be discharged normally, a long time to accumulate in the arm parts, thus triggering the pain phenomenon; 2, tendinitis: tendinitis patients if not actively anti-inflammatory treatment, will cause pain in multiple joints throughout the body, it is recommended that patients local hot compresses, or follow medical advice to use pain medication, such as ibuprofen to relieve; 3, synovitis. Mostly aseptic inflammation, produced by the synovial membrane is irritated. Initially, the arm is not red or swollen, but if the local secretion accumulates over time, the joint will be swollen and depressed by pressure; 4, tennis elbow: due to long-term repeated, strenuous flexion and extension movements, such as finger extension, wrist extension, rotation of the forearm and elbow joint activities, resulting in excessive strain on the muscles and tendons around the arm, thus causing chronic inflammatory injury. The main manifestation is a gradually increasing pain in the arm, which is usually not red or swollen in appearance, but sometimes the patient may feel a burning sensation. In severe cases, the patient may experience numbness and weakness in the arm and may not be able to perform daily activities, which affects the patient’s quality of life. In addition to the above, arm pain without redness and swelling may also be due to factors such as bone cysts and bone tumors. When such symptoms occur, patients are advised to minimize their activities and follow medical advice for medication. For more serious symptoms, it is recommended to go to the hospital for X-rays and other examinations, and the doctor will give a comprehensive treatment plan based on the examination results and the patient’s condition.