There is no strict restriction on which arm the vaccine can be administered to, the left side and the right side can both be selected by the vaccinator, and both can achieve the effect of immunization. Usually you can choose the arm that has less impact on your daily activities, pay attention to the vaccination schedule, and avoid the relevant contraindications. Vaccinators can choose either arm for the vaccine, and those who have two doses can have both doses on the same arm or both arms separately. Some vaccinees may experience localized redness, swelling, pain, fever, and even weakness in the upper limbs after receiving the vaccine, which are normal and can usually be relieved with rest. Most people in life are right-handed, so you can choose the left arm for vaccination to reduce the inconvenience of daily activities. After the vaccination, you need to avoid water at the needle hole temporarily to avoid infection, and ensure the cleanliness of the needle hole area, which can effectively avoid the pain in the arm that may be caused by wound infection. For a short period of time after the vaccination, it is recommended to have a light diet, eat more fresh fruits and vegetables to ensure balanced nutrition, and not to drink alcohol or eat too spicy, cold and other stimulating foods; to ensure sufficient rest, avoid frequent use of the arm to lift heavy objects, which may cause muscle damage, avoid staying up late and straining, and maintain good living habits.