After the third dose of New Crown Vaccine, the vast majority of people have no adverse reactions, a few may have localized adverse reactions, and very few have systemic adverse reactions. 1. No adverse reactions: The vast majority of patients who have received the third dose of New Crown Vaccine have no adverse reactions. 2. Local reactions: After a few vaccinations, local reactions such as slight redness, pain, itching, swelling, hardness, etc. may occur at the vaccination site. It is recommended to avoid rubbing the local area and strenuous activities on the same day after vaccination to avoid aggravation of the adverse reactions. 3. Systemic reactions: a very small number of inoculations may appear after low fever, dizziness, headache, fatigue, muscle pain, loss of appetite, nausea, vomiting, diarrhea and other systemic adverse reactions. After vaccination, you should observe the vaccination point for half an hour before leaving, mild adverse reactions usually do not need specialized treatment, and can be relieved after 2~3 days, if the adverse reactions persist and have a tendency to worsen, or allergic reactions should seek medical treatment in time.