If the pain in the arm is caused by holding the child for a long time, the main reason is that the local muscles are tense and tight for a long time when the patient is holding the child, which leads to local muscle strain. It is recommended that the patient must take proper rest and apply hot compresses and massage to effectively relieve the pain symptoms. If the pain is not significantly improved by the above rest or hot compress, the patient is recommended to go to the hospital for relevant examination. If the pain is confined to a certain area, the area can be closed for treatment, which can effectively relieve the pain. In general, the drugs used for closure, such as dexamethasone injection or tretinoin injection, can play an effective anti-inflammatory and analgesic role, which can relieve the pain in the arm.