It is recommended not to eat ice-cream immediately after vaccination because some vaccines may cause gastrointestinal adverse reactions such as nausea and vomiting, and eating ice-cream immediately may induce or aggravate gastrointestinal adverse reactions. Ice-cream itself can also cause digestive discomfort, which can be easily confused with adverse reactions to vaccines, or the effects of both can be superimposed, making the vaccinees feel more uncomfortable, so it is not recommended that vaccinees eat ice cream immediately after vaccination. It is recommended that after 1-2 days of observation, if there is no adverse reaction, ice cream can be eaten in moderation, but it is still not recommended to eat large amounts, and if there are discomfort symptoms, ice cream is not recommended. Ice-cream usually has no significant effect on the effect of the vaccine, so adults with normal gastrointestinal function can eat ice cream in moderation after observation, but even without gastrointestinal disease, the intake of too much cold food may cause gastrointestinal discomfort symptoms, so ice cream needs to be eaten in moderation; while some vaccinees with weak gastrointestinal function or gastrointestinal disease or infants and children may experience abdominal pain, If abdominal pain, nausea and vomiting occur after vaccination or after eating ice-cream, it is recommended to go to the hospital promptly. Some ice-cream contains a large amount of milk and dairy products, and some people who are allergic to these ingredients may have an allergic reaction after eating them, with symptoms such as skin rash and itching. To avoid adverse reactions or allergic reactions, it is recommended that vaccinees with a history of relevant allergies should not consume foods that are too cold and stimulating, such as ice cream, after vaccination.