The arm pain may be caused by the following reasons: 1. sleeping on one side for a long time at night, so that the unilateral axilla is pressed for a long time, so that the brachial plexus nerve and the blood vessels in the axilla are pressed, resulting in a series of symptoms. 2. it may be due to excessive strain during the day, or regular lifting of heavy objects in the arm, or the arm is stimulated by wind and cold, etc., which induces arm pain. In case of arm pain, it is recommended not to sleep on one side for a long time at night, and try to sleep in a supine position, and also give local heat compresses and massage for relief. If the pain is severe, patients can also take oral ibuprofen extended-release capsules for relief.