Vaccine reactions mainly include general reactions caused by the vaccine and abnormal reactions caused by problems with the patient’s constitution. General reactions such as fever and injection site pain usually do not require special treatment and will subside as the vaccine is gradually absorbed by the body. However, if a vaccinated person has a rare abnormal reaction such as respiratory obstruction or anaphylactic shock, he or she needs to go to the hospital promptly for relevant consultation and treatment. After vaccination, the immune function of the body will be temporarily disturbed, and the vaccinated person will be more sensitive to external environmental stimuli and may experience fever, nausea, loss of appetite, fatigue, and local redness, itching and rash. Abnormal reactions 1. Respiratory obstruction: This is mainly due to the vaccine recipient’s allergy to the vaccine, which leads to respiratory problems such as throat edema, bronchospasm and pulmonary edema, thus causing respiratory obstruction. The vaccine recipient may have chest tightness, shortness of breath, difficulty in breathing, etc., accompanied by a sense of near death; 2. Circulatory failure: when the vaccine is allergic, it may cause vasodilation in the body, resulting in insufficient effective blood circulation, and the vaccine recipient may have pale face, cold sweat, decreased blood pressure, and other signs of anaphylaxis; 3. The change of consciousness may also cause hives, abdominal pain, diarrhea and other symptoms. Patients should read carefully the precautions and contraindications of vaccination before vaccination, and they should provide various basic information such as medical history, allergy history, and travel history to the medical staff in time to prevent serious abnormal reactions after vaccination. In addition, patients should also be careful to avoid vaccination in irregular hospitals or other places to avoid serious harm to the organism from vaccines produced by unknown manufacturers.