What are the side effects of the inactivated hepatitis A vaccine injection?

After receiving the inactivated hepatitis A vaccine, a series of side effects may occur, but these are usually mild and temporary. 1. Pain, redness, swelling, and warmth may appear at the injection site, which represent the body's normal immune response to the vaccine. These symptoms generally resolve on their own within a few days. 2. Some vaccine recipients may experience fever, typically low to moderate grade, which may be accompanied by chills, sweating, and similar symptoms. With appropriate rest and observation, specific treatment is generally not required. 3. Gastrointestinal reactions such as nausea, vomiting, and diarrhea may also occur, but symptoms are usually mild and will typically disappear on their own within 1-2 days. 4. Allergic reactions and neurological symptoms are relatively rare but should still be taken seriously. If an allergic reaction occurs, prompt medical attention is necessary. If you experience severe discomfort or symptoms that do not resolve in a timely manner, seek medical attention promptly.