A fever that develops after receiving the flu vaccine usually resolves on its own within 2-3 days, and in some cases the fever resolves on the same day of vaccination. After receiving the influenza vaccine, the body will respond to the vaccine and stimulate the body’s immune system to produce antibodies against the influenza virus to effectively prevent influenza. In addition to fever, there may also be slight local redness, runny nose, dry throat, sore throat, cough, etc. This is usually normal and does not require any intervention. During this period, pay attention to keep the vaccination site clean and avoid contact with water to avoid local infection, which may lead to an increase in fever and prolongation. After receiving the flu vaccine, pay attention to adequate rest and a light diet. If the fever does not subside or other uncomfortable symptoms appear, it is recommended to seek medical attention from the fever clinic or the corresponding department in a timely manner.