A headache the day after the vaccination is normal in most cases. The headache is one of the more common adverse reactions and usually does not require special treatment and can disappear on its own. In addition, headache the day after New Crown vaccine is probably not caused by New Crown vaccine and is not related to the vaccine, but may be caused by migraine or tension headache, which may be mistaken as an adverse reaction of the vaccine because of the tension after the vaccine. Headaches the day after the New Crown vaccine may not be normal in a few cases. If a patient has a headache accompanied by symptoms such as severe vertigo, nausea and vomiting, blurred vision, etc., it is recommended to seek prompt medical attention, which may be caused by cranial occupational disease and requires prompt treatment. If the headache cannot be relieved for a long time and seriously affects work and life, it is necessary to consult a doctor for CT examination to exclude cranio-cerebral diseases. If there is no organic disease, you can follow the doctor’s prescription for pain management. When taking the new crown vaccine, be careful to stay in the observation area for 30 minutes after the vaccination is finished and leave again when there is no physical discomfort. Do not let the injection site get wet within 24 hours, take proper rest, ensure a good lifestyle, do not smoke, drink alcohol, etc.