The third injection of vaccine arm is very painful is generally a normal phenomenon, usually can be recovered within 3~5 days, during the recovery period, pay attention to keep the injection site clean, dry, light diet, do not drink alcohol. The symptoms of arm pain after the third injection of the vaccine is generally a normal phenomenon, may be due to the vaccine components of the local skin and muscle irritation caused by the hot towel can be localized hot compresses, massage and other ways to promote local blood circulation, to relieve the pain symptoms, the pain caused by this situation can be relieved within 3 ~ 5 days generally on their own. In addition, after the vaccine, should also pay attention to keep the injection site clean, dry, to avoid local infection. After vaccination, you should pay attention to stay up late, eat a light diet, do not drink alcohol, and try to avoid contact with substances that can easily cause allergies. If severe adverse reactions occur or persist after vaccination, it is recommended to go to the hospital in time.