A proportion of people who have received the third vaccine may have localized and systemic adverse reactions, as well as more severe allergic reactions or no reactions at all. After the third vaccination, localized pain, redness, swelling, itching, hard nodules and other reactions at the vaccination site may occur, which are normal adverse reactions to vaccination and can usually be cured on their own. Systemic adverse reactions such as muscle pain, nausea and vomiting, fever, and fatigue may also occur, but generally to a lesser extent. However, some people may experience more serious allergic reactions such as shortness of breath and anaphylaxis due to their own physical condition and history of severe allergies, which require prompt medical attention. The majority of the population can also be vaccinated without significant adverse reactions, which is normal. After vaccination, you should observe the vaccination site for half an hour before leaving, and if you feel unwell, you need to actively seek medical treatment.