Vomiting from vaccination is mostly considered to be caused by physiological reactions and vaccine reactions. If vomiting is frequent, seek medical attention promptly and deal with it after clarifying the causes. I. Common causes and treatment 1. Physiological reaction: If you are overly nervous and cry during vaccination and fail to take sufficient rest after vaccination, it may lead to reflex vomiting. Active emotional adjustment, relaxation, adequate rest and light diet can generally improve within a short period of time. 2. Vaccine reaction: If there is slight vomiting and other slight discomfort after vaccination, such as slight redness, swelling, heat and pain at the vaccination site, it can be considered a slight adverse reaction to the vaccine, which does not require special treatment and can disappear on its own in about 3 days. If there is severe vomiting, accompanied by high fever, diarrhea, nausea, general weakness and other symptoms, you need to go to the hospital for examination and treatment in time, and use the necessary symptomatic treatment, give antiemetic drugs and rehydration treatment, etc. If there is any discomfort, the medical personnel present can handle it in time, so don’t be too nervous. After returning home, take sufficient rest, avoid staying up late, eat a light diet, do not eat spicy and stimulating food, and pay attention to cold and warmth. Avoid getting water on the injection site on the day of vaccination and pay attention to local hygiene to prevent infection.