After the flu vaccination, there are some vaccination reactions, sometimes low fever or occasionally high fever, and possibly a rash. This is when symptomatic treatment is sufficient. If you have a high fever, you can take oral antipyretics. Generally, after 2-3 days after vaccination, symptoms such as fever, cough, nasal congestion, runny nose, etc. should be caused by a cold, not a vaccination reaction after vaccination. At this time, the relative treatment should be given according to the specific symptoms. If the symptoms are simply ordinary symptoms, such as stuffy nose, runny nose, sneezing, you can take some symptomatic cold medicine orally as appropriate. If there is a high fever, give the corresponding antipyretic medicine, usually with ibuprofen or acetaminophen. If the symptoms are more serious, the person’s mental state is not good, and very uncomfortable, it is best to go to the hospital to do the appropriate examination, and at the same time let the doctor face to face to see.