After the hepatitis B vaccine if you have already eaten spicy food, you should closely observe the child within 3 days of the production of side effects: 1, if the child injection site redness, swelling, hard knots and other symptoms may be aggravated, may be painful, this situation can use ice to relieve the local injection site pain, is a certain role. If there are signs of local inflammation, if necessary, you need to apply iodophor for disinfection treatment and close observation. 2, it is possible that the child will have the phenomenon of fever, the temperature of fever if it does not reach 38 ℃ or 38.5 ℃, you can give more water, wipe with warm water, do not wipe to the injection site, repeatedly and constantly wipe, especially the neck, underarm, groin and other parts of the blood vessels more wipe, is conducive to A treatment to reduce fever. If the temperature continues to rise, it means that the child’s symptoms are more serious and need to be treated at the hospital.