Recently, there has been a lot of news about vaccines, and chickenpox has also entered the seasonal high season since this month, and every day is dominated by problematic vaccines. What adverse reactions are normal after vaccination? What can we do in case of adverse reactions? Vaccines are biological products intended to prevent and control the occurrence of infectious diseases and are used for human vaccination. Its mechanism is actually to inject pathogenic microorganisms or their metabolites into the human body after they have been made by attenuated and fire-extinguishing methods, so as to stimulate the body to produce an immune response and achieve the prevention of pathogenic microorganisms. What are the adverse problems brought to us by the problematic vaccines that are “on fire”, as the pictures shared today still tell a good story. Here I will talk about what are the adverse reactions to regular vaccination? What should we do if our child has an adverse reaction? How exactly are these adverse reactions caused? Any vaccine may produce certain uncomfortable reactions after vaccination because although the disease-causing components have been attenuated and killed, there will still be certain toxicity and some allergic reactions and adverse reactions may still occur, which we call general adverse reactions and is a normal phenomenon. (1) Redness and swelling will appear at the injection site after vaccination, and even pustules will appear after vaccination, and secretions will break out and then crust off by themselves, which is a normal phenomenon and parents need not panic; (2) If hard nodules appear after vaccination, which is also a normal phenomenon, hot towels can be applied to promote the dissipation of local hard nodules for about 15 minutes each time, three or four times a day; (3) Fever is the most common adverse reaction after vaccination. (3) Fever is the most common adverse reaction after vaccination, generally the temperature will not exceed 38℃, if the body does not have other discomfort, it can not be treated. If the body temperature exceeds 38℃, physical cooling, more rest and more water can be given. The above adverse reactions are determined by the nature of the vaccine itself, and the degree of reaction is within a certain limit and is transient rather than permanent, and will not cause irreversible organ damage. If the vaccination causes damage to the tissues and organs of the organism of the vaccinated person, and if the adverse drug reactions occur without vaccine quality problems or vaccination errors, they are called abnormal reactions after vaccination. The more common ones are anaphylactic reactions and sterile abscesses. Among the allergic reactions, allergic rash is more common, followed by allergic purpura, thrombocytopenic purpura, angioedema and neurological diseases such as epilepsy and encephalitis. Certain vaccines have specific adverse reactions, such as BCG vaccination causing lymphadenitis, osteomyelitis and systemic disseminated infection. If high fever is accompanied by dyspnea, major axillary lymph nodes on the side of vaccination, hives, pallor, and tachycardia, it is necessary to seek immediate medical attention at this time. The factors leading to adverse reactions to vaccines are various: 1. quality of vaccine The quality of a batch of vaccine is not qualified, the purity of the vaccine is low, there are problems with the strain and uniformity of the vaccine, the production process of the vaccine, the addition of adjuvants and preservatives in the vaccine, and the cold chain equipment of the vaccine, all of which will affect the quality of the vaccine; 2. type of vaccine Some vaccines are more prone to adverse reactions than others, which is determined by the nature of the vaccine itself. This is determined by the nature of the vaccine itself. According to some reports, after vaccination, adverse reactions such as fever, redness, swelling, and hard nodules are likely to occur at the injection site; 3. The level of vaccination by medical personnel Negligence of vaccination personnel leads to misplantation, wrong use of diluent, wrong vaccination site, and poor disinfection of vaccination, and the degree of adverse reactions varies; 4. Some children are allergic, and some vaccines cannot be inoculated. It is undeniable that vaccines are of great merit in controlling and preventing diseases. Some mild symptoms during vaccination are normal and parents should not worry too much. The risk of adverse reactions to vaccinations is much less than the risk of spreading infectious diseases due to non-implementation of vaccination. Under the condition of ensuring the quality of vaccines, the probability of more abnormal reactions to vaccines is very small, but once more severe abnormal reactions occur, it is necessary to seek medical attention in time. Although the news of vaccine problems is all over the place, objectively speaking, vaccines are still a credit to human beings.