Adverse reactions following hepatitis B vaccination

After hepatitis B vaccination, pain and tenderness at the injection site may occur; in most cases, these symptoms resolve spontaneously within 2–3 days. Other rare adverse reactions include transient fever occurring within 72 hours post-vaccination, typically lasting 1–2 days and resolving without intervention; mild-to-moderate redness and pain at the injection site, usually subsiding spontaneously within 1–2 days; and induration (hardening) at the injection site, which generally resolves spontaneously within 1–2 months.

Adverse Reactions Following Hepatitis B Vaccination

1. Fever

Fever is a relatively common symptom following hepatitis B vaccination. This phenomenon is considered normal, as many vaccines can induce transient fever. Typically, this symptom resolves spontaneously within one or two days, so there is no need for concern. During this period, drinking warm water may help promote metabolism and facilitate fever reduction.

2. Injection-Site Pain

Some individuals may notice abnormal reactions at the injection site after hepatitis B vaccination, such as redness, swelling, and pain. These symptoms may result from improper local care leading to secondary infection. Therefore, it is recommended that the injection site not be washed with water for at least two days post-vaccination, and that the skin at the injection site be kept clean and dry.

3. Loss of Appetite and Fatigue

Some individuals may experience reduced appetite, nausea, vomiting, or general malaise following hepatitis B vaccination—potentially due to a drug-related reaction. In such cases, consuming more vegetables, fruits, and mildly acidic foods may help alleviate these symptoms. Additionally, some individuals may experience generalized fatigue, dizziness, or headache after vaccination.

The above outlines the common adverse reactions associated with hepatitis B vaccination. We hope this information is helpful to you.