The new crown vaccine is the new coronavirus vaccine, and the pain in the arm after vaccination and the inability to lift the arm may be caused by improper injection operation or adverse drug reactions, which can usually be relieved by themselves without special treatment: 1. Improper operation: If the vaccine is operated in an improper way, such as when the injection site is too deep and the drug is input too fast, it will lead to the drug not being completely absorbed by the tissue and Part of the drug exuded, thus stimulating the local muscles and causing pain, resulting in the phenomenon of not being able to lift the arm after vaccination; 2. Adverse drug reactions: Since the new crown vaccine is a vaccine made by inactivating or attenuating the pathogen, it may cause some transient and mild organism reactions in a few people due to individual differences, such as redness, swelling, hard nodules and itching at the inoculation site, and also including local reactions such as arm pain and not being able to lift the arm. The reactions may also include local reactions such as pain in the arm and inability to lift the arm. If your arm is painful and you can’t lift it after vaccination, you can massage it locally or use a hot towel to promote blood circulation and relieve the symptoms, which will gradually disappear 2-3 days after vaccination. At the same time, it is necessary to pay attention to proper rest, avoid overworking the painful part of the arm, and pay attention to keeping the injection site clean to avoid causing infection. If the symptoms are not relieved for a long time or are accompanied by other uncomfortable symptoms, it is recommended to go to the hospital for examination and treatment.