General adverse reactions to the New Crown vaccine include redness, swelling, pain, and hardness at the vaccination site. Symptoms such as allergies and breathing difficulties may also occur in severe cases. The New Crown vaccine is mainly used to prevent infection by chemically disabling the virus from replicating and becoming infectious. Adverse reactions such as localized redness, swelling, pain and hard nodules may occur after receiving the New Crown pneumonia vaccine, which are generally more common but the symptoms are mild and can usually be relieved on their own. If you are allergic to the components of the vaccine, your body may have a strong allergic reaction, with respiratory difficulties and anaphylactic shock, etc. In the event of an allergic condition, prompt resuscitation is required. After the injection of the new crown pneumonia vaccine, we must always observe the changes in the body, if discomfort occurs, consult a doctor in time to avoid delays in the condition. [Tips] In this article, “new coronavirus pneumonia” and “new coronavirus pneumonia” have been renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.