After chickenpox vaccination, there are reactions such as slight redness, swelling and pain at the vaccination site, transient fever and allergy. 1. Slight redness, swelling and pain at the vaccination site: After chickenpox vaccination, due to the stimulation of the local area by the drugs, slight redness, swelling or hardness may appear locally, accompanied by slight pain. These symptoms will be gradually relieved on their own, and generally do not require special treatment. 2. Transient fever: after chickenpox vaccination, due to the immune response, some patients will have a transient fever. Usually a mild low-grade fever is the main cause, and the duration is usually not long. 3. Allergy: A very small number of patients will have allergic reactions such as rash and itching after chickenpox vaccination. If the symptoms of the reaction is serious, it may lead to generalized rash or even anaphylactic shock, and timely medical attention is needed. Varicella vaccine is contraindicated in patients with severe infectious diseases, those with known allergies to the components contained in the vaccine, those with fever symptoms, and those with immunodeficiency. If you need to take chickenpox vaccine, it is recommended that you actively consult a professional doctor and listen to his or her advice to take the injection.