Painful stretching of the lower arm requires different relief measures depending on the specific symptoms. There are physiological and pathological causes, and pathological causes include tendonitis and frozen shoulder. Specific relief methods include physical therapy, medication, and surgery. 1. Physiological: If the patient catches a cold and blows the air conditioner unilaterally for a long time, such symptoms are likely to occur. You can massage appropriately and use hot compresses on the stretching pain area to promote blood circulation and increase metabolism, which can relieve the symptoms to a certain extent. You can also go to the regular rehabilitation institutions, magnetic therapy, but also for the stretching pain will be relieved. 2. Tendonitis: Tendonitis can be treated conservatively with hot compresses and physical therapy. If the pain is too strong, you can follow the doctor’s instructions to take non-steroidal anti-inflammatory drugs, such as Loxoprofen sodium tablets anti-inflammatory and analgesic, can be effective in relieving pain in the small arm. Closure surgery can also be performed. 3. Frozen shoulder: Frozen shoulder is self-limiting and can heal itself. Appropriate hot compresses, physiotherapy, massage to accelerate the pain relief. Therefore, when the patient’s small arm stretching pain lasts for a long time, it is recommended that the patient go to the hospital as soon as possible to check and follow the medical advice for treatment.