You can wash your hair just after vaccination, but you should be careful not to let the vaccination site touch water or soak in water to prevent infection at the eye of the needle. You should not wash your hair for too long, and the water temperature should be moderate and not too cold; you should not go outside immediately after washing your hair, and you should pay attention to keeping warm and not blowing cold wind. In addition, after the vaccination, you should eat a light diet, eat more vegetables and fruits, such as tomatoes and cabbage, avoid staying up late and get more rest. And note that the common symptoms of vaccine reactions after vaccination are as follows: 1. Local reactions: after vaccination, slight reactions such as redness, swelling, pain and fever may occur at the injection site, occasionally accompanied by loss of appetite and fever; 2. Systemic reactions: such as fever, weakness, headache, muscle pain, diarrhea, nausea, cough and other symptoms. The above-mentioned reactions are normal vaccine reactions, which do not require special treatment and can return to normal in a few days after proper rest and drinking more warm water.