What are the adverse reactions to hepatitis A vaccine?

The purpose of injecting the hepatitis A vaccine is to enable the body to produce antibodies to effectively prevent hepatitis A. However, some people will experience adverse reactions after receiving the hepatitis A vaccine, such as fatigue, fever, anorexia, vomiting, etc.

1. Fatigue, fever, anorexia, and diarrhea

The human body tolerates the hepatitis A vaccine well, and most people do not experience any adverse reactions to the vaccine after vaccination. A small number of people may experience mild redness, swelling or slight pain at the injection site. The above adverse reactions to the hepatitis A vaccine generally subside within 24-72 hours and are normal adverse reactions to the hepatitis A vaccine. A very small number of people may experience symptoms such as fatigue, fever, anorexia, diarrhea, nausea, vomiting, allergic rash, etc. These adverse reactions to hepatitis A vaccine are usually short-lived and most of them will resolve on their own within 24 hours. Generally speaking, mild adverse reactions do not require special treatment and can heal on their own. If the local reaction is severe, local hot compresses can be applied after 72 hours, several times a day, each time for 10-15 minutes. For more serious adverse reactions to hepatitis A vaccine, symptomatic treatment can be adopted if necessary. Those who are receiving vaccination for the first time should stay for observation for half an hour after the injection to prevent immediate allergic reactions. If there are abnormal reactions or delayed allergic reactions within 72 hours after returning home, they should go to the hospital for diagnosis and treatment as soon as possible to avoid missing the rescue opportunity.

2. Don’t worry too much

It is normal to experience these side effects of the hepatitis A vaccine after being injected, because the hepatitis A vaccine itself is a virus with reduced activity or inactivated, and certain side effects are inevitable after vaccination. These adverse reactions to the hepatitis A vaccine usually disappear on their own. If these adverse reactions do not subside after two to three days, you need to go to the hospital to check the cause and receive targeted treatment. Some special adverse reactions, such as high fever, also require targeted treatment in the hospital, so there is no need to worry too much.

3. Countermeasures

Generally speaking, mild adverse reactions do not require special treatment and can heal on their own. If the local reaction is severe, local hot compresses can be applied after 72 hours, several times a day, each time for 10-15 minutes. For more serious adverse reactions to hepatitis A vaccine, symptomatic treatment can be adopted if necessary. Those who are receiving vaccination for the first time should stay for observation for half an hour after the injection to prevent immediate allergic reactions. If there are abnormal reactions or delayed allergic reactions within 72 hours after returning home, they should go to the hospital for diagnosis and treatment as soon as possible to avoid missing the rescue opportunity.