Studies have shown that some adverse reactions may occur after vaccination with any vaccine, which cannot be avoided, but the severity of the adverse reaction and the symptoms presented are closely related to the individual’s constitution. Some vaccinees experienced arm pain after receiving the New Crown vaccine, which is part of the vaccine-induced immune response and is a common adverse reaction. In this case, as long as the symptoms are not serious and the vaccinees are not accompanied by serious symptoms such as high fever, chills, and allergies, there is no need to worry too much. Because local puncture wounds caused by needles, subcutaneous bleeding or vaccine components during vaccination can cause irritation to local tissues, it is a normal situation to have arm soreness. It should be noted that if the symptoms of arm pain are obvious, first of all, you must avoid strenuous exercise and exertion and ensure sufficient rest, and secondly, you can avoid the vaccination site and use a hot towel to gently apply and slowly rub your arm. If you still have more obvious pain and other uncomfortable reactions after a week, it is recommended to seek medical attention in time to see if it is an abnormal reaction. If it is a suspected abnormal reaction, you need to report the vaccination site and provide relevant medical records and medical history information; if not, use pain medication under the guidance of a doctor and avoid overuse of the arm. In addition to arm pain, common adverse reactions to the new crown vaccine include, fever, local redness, swelling, hard nodules, weakness, nausea, headache, etc. However, these are all transient reactions of the body, which are caused by the biological characteristics of the vaccine itself, and the symptoms will gradually disappear 2-3 days, or within a week after vaccination, so there is no need to worry. However, if the adverse reactions do not gradually resolve or even tend to worsen, it is recommended to seek medical attention immediately to avoid blind medication.