Eating spicy food on the day after vaccination usually does not make the vaccine ineffective and does not affect the vaccine effect too much, but it may induce or aggravate adverse reactions and allergic reactions, especially for vaccinees who have a history of spicy food allergy, so it is not recommended to eat spicy food on the day after vaccination. Vaccines mainly stimulate the body to produce immune response through antigens to prevent and control diseases, and the consumption of spicy food generally does not have a significant impact on the body’s immune system, so it will not prevent the vaccine from playing a preventive role, but the following adverse reactions may occur after eating spicy food: 1. Exudation may increase, easily leading to local redness, swelling, hard knots, pain, and increased skin temperature. In severe cases, local exudation may occur. Allergic reactions: If the vaccinated person is allergic, he may have allergic symptoms after consuming chili pepper, or he may be allergic to the vaccine himself, which may aggravate the allergic reaction, and the allergic person may have rash, itching and other symptoms, which require immediate medical attention and treatment; 3. Gastrointestinal symptoms: Some people may have gastrointestinal discomfort symptoms such as abdominal pain and diarrhea after vaccination, and chili pepper can promote Gastrointestinal motility can aggravate the above digestive symptoms or cause abdominal pain and diarrhea. In addition, eating spicy food can also cause sweating, which may cause contamination of the injection site and is detrimental to the recovery of the injection site. For these reasons, it is usually not recommended to eat spicy and stimulating food on the day of vaccination, and it is recommended to eat spicy food in small amounts at least 3 days after vaccination. If there is no adverse reaction, you can slowly return to the normal amount of spicy food. Try to choose light and nutritious foods such as meat, eggs, milk, vegetables and fruits within one week after vaccination to supplement protein, vitamins, trace elements and other nutrients.