Vomiting, whether it occurs after a vaccination or at other times, is not a normal occurrence. Whenever vomiting occurs, it indicates that there is some dysfunction of the gastrointestinal tract. It may be a result of eating too much during meals, or it may be a result of some disease of the stomach. If vomiting occurs after a vaccination, it is important to take into account the adverse effects of the vaccine. If the vomiting is accompanied by a significant fever and the gastrointestinal discomfort continues after the vomiting, the vomiting should be considered to be caused by the vaccine and can be treated by going to the hospital for relevant examinations. If the vomiting occurs alone, without any other discomfort such as fever, and no other symptoms occur after the vomiting, it is also necessary to consider factors other than the vaccine, so you can eat a little lighter and less often, and then continue to observe the change of symptoms.