If there is no local redness or swelling or other discomfort, arm pain after vaccination is generally a common phenomenon after vaccination and is mostly due to local irritation caused by vaccine injection. After vaccination, pay attention to rest and avoid excessive use of the arm on the injection side. Under normal circumstances, arm pain caused by vaccination can disappear after 2-3 days. If the pain is more severe, you can perform some wet compress operations to help relieve it, such as using magnesium sulfate wet compress for local anti-inflammatory treatment; you can also use cold compress to relieve pain and reduce edema; about 6 hours after ice compress, you can apply hot compress to the injection site to promote the absorption of drugs and edema and speed up wound recovery. When performing the above operations, care needs to be taken to keep the injection site clean and dry and not to contaminate the injected site. If the pain at the injection site cannot be relieved, or is accompanied by redness, swelling, high local skin temperature, fever and other symptoms, it may be pain caused by infection, and it is recommended to contact the doctor of the vaccination unit in time and seek medical attention for a clear diagnosis if necessary. After vaccination, it is also necessary to pay attention to not strenuous exercise, pay attention to a light diet, drink more water, avoid drinking alcohol, and avoid spicy and stimulating food. On the one hand, it can reduce the occurrence of adverse reactions after vaccination, and on the other hand, it can avoid aggravating the pain in the arm.