Hepatitis B vaccine does not delay menstruation. Hepatitis B vaccine is an effective means of preventing hepatitis B virus infection. Common adverse reactions include local discomfort, general discomfort and rare adverse reactions. 1. Local discomfort: redness, swelling, heat, pain and other inflammatory reactions at the vaccination site are temporary and will generally subside on their own without special treatment. 2. Systemic discomfort: including fever, dizziness, fatigue, drowsiness, gastrointestinal discomfort, etc., mostly disappear within 24 hours. 3. Rare adverse reactions: aseptic suppuration, allergic reaction, anaphylactic shock, etc. It is recommended to observe for 30 minutes after vaccination before leaving the vaccination unit. Hepatitis B vaccination will not delay menstruation. Common causes of delayed menstruation include early pregnancy, mental stress, endocrine disorders, abortion surgery, tumors and other factors.