If you have arm pain after taking the vaccine, you can relieve it by applying localized hot compresses, and if it is serious, you are advised to seek medical treatment and take painkillers under the guidance of a doctor. The vaccination site of the nine-valent vaccine is usually the upper arm, and some people will have local pain symptoms after vaccination, which is a common adverse reaction, do not have to worry too much. Through local hot compresses, infrared radiation or hot water soaking hands and other methods to accelerate blood circulation, can effectively relieve the pain symptoms after intramuscular injection. However, if the pain symptoms continue to be unrelieved, or even gradually aggravated, it is recommended to seek medical treatment in a timely manner, under the guidance of the doctor to take pain medication such as ibuprofen, diclofenac sodium, can be realized after the effective relief of pain. Therefore, when the symptom of arm pain occurs after vaccination with the nine-valent vaccine, first of all, you can use hot water to apply local compresses, infrared irradiation to the vaccination site, or hot water to soak your hands. However, when the pain worsens and is difficult to relieve, medical attention is required. It is recommended not to take a bath in the short term after vaccination, and drink more water to accelerate metabolism, which can effectively avoid the occurrence of adverse reactions.