Arm pain after vaccination is a relatively common post-vaccination adverse reaction, which is commonly caused by local tissue irritation or slow absorption of the drug after local injection of the drug. Usually, the painful symptoms can be relieved by themselves 2-3 days after vaccination. If arm pain persists after vaccination and is not relieved, you can use a warm towel and apply a local moist hot compress for about 30 minutes each time, 3 times a day, to help relieve arm pain. If the pain worsens, you need to go to the hospital promptly. In addition, pay attention to monitoring your body temperature changes, if there is a high fever or allergy, you also need to go to the hospital in time to take timely measures to deal with the situation. You also need to pay attention to ensure rest after vaccination for arm pain, especially you need to avoid lifting and pulling heavy objects to avoid aggravating the pain symptoms. At the same time, it is necessary to ensure that the injection site is clean and dry, avoiding friction and water contamination to avoid local infection and aggravation of symptoms. You should also pay attention to avoid smoking and drinking alcohol, and try not to eat spicy and irritating foods, such as ginger, curry, chili, etc., so as not to aggravate the inflammatory reaction, which is not conducive to the recovery of the injection site or arm pain relief.