Fever for a short period of time after vaccination is a common adverse reaction to vaccination and is normal. Vaccination is the technique of inoculating the body with a vaccine preparation so that the recipient acquires immunity against the corresponding pathogen. Vaccines contain inactivated pathogenic microorganisms or substances extracted from pathogenic microorganisms. After injection, the body can produce antibodies that kill the pathogenic microorganisms, thus preventing the disease. After vaccination, due to the characteristics of the vaccine itself, some vaccinees may have an elevated body temperature 5~6 hours after vaccination, and the fever usually lasts for 1~2 days, and seldom exceeds more than 3 days, which is usually a normal phenomenon after vaccination, and can be gradually returned to normal. In addition to elevated body temperature, some people may also appear inoculation local redness, swelling and pain, and headache, dizziness, fatigue, nausea, vomiting, abdominal pain and other symptoms, usually lasts for 1~2 days can disappear on their own, without special treatment. Fever after vaccination, you can pay attention to appropriate rest and warmth, drink more water, if necessary, the application of antipyretic and analgesic drugs to ease the discomfort. It should be noted that if the fever after vaccination exceeds more than three days or serious symptoms such as high fever and urticaria appear, you should go to the hospital in time.