Hepatitis B: How It Spreads, Prevention and Testing

Editorial correction — 10 October 2026: this article was first published on 8 October 2021. It has been rewritten to correct misleading transmission advice, remove unsupported statistics and distinguish hepatitis B from other causes of liver damage. The original URL is retained.

Hepatitis B is a liver infection caused by the hepatitis B virus (HBV). It can be short-term or persistent. Persistent infection can damage the liver and increase the risk of cirrhosis and liver cancer. The World Health Organization identifies vaccination as an effective way to prevent infection.

How hepatitis B spreads

Transmission occurs when infected blood or certain body fluids enter another person’s body. Routes include birth from an infected mother, sexual contact, contaminated needles and inadequately sterilised tattooing, piercing or medical equipment.

The CDC explains that hepatitis B does not spread through hugging, coughing, sneezing, sharing utensils, or food and water. A person can have and transmit the infection without obvious symptoms. Everyday social contact should not be treated as a reason to exclude someone.

Prevention means more than lifestyle advice

• Ask a health professional whether your hepatitis B vaccinations are complete and whether you need vaccination or testing. Recommendations vary by country, age and exposure risk.
• Use condoms or dams during sex, and avoid sharing needles, razors or toothbrushes.
• Choose services that use properly sterilised equipment for procedures that pierce the skin.

In the UK, hepatitis B vaccination is included in the routine infant 6-in-1 vaccine; additional arrangements apply to babies born to mothers with hepatitis B. Adult eligibility is risk-based. See the NHS guidance for local advice.

Alcohol and sugar are not routes of HBV infection

The earlier version mixed infection prevention with advice about other liver problems. Drinking alcohol or eating sugar does not transmit the hepatitis B virus. Avoiding them cannot replace vaccination, safer practices or testing.

Alcohol can harm the liver. The NHS advises people living with hepatitis B not to drink alcohol. Discuss medicines and supplements with your clinician rather than assuming a product is safe for your liver.

Symptoms cannot confirm or rule out infection

Some people develop jaundice, dark urine, marked tiredness, nausea, vomiting or abdominal pain; others have no symptoms. These signs can have other causes. Diagnosis requires blood tests, not a symptom checklist.

If you think you may have hepatitis B or be at risk, contact a GP or another qualified healthcare professional. People with chronic infection need follow-up; antiviral treatment may be appropriate to reduce liver damage.

Sources and scope

This is general health information, not an individual diagnosis or treatment plan. Sources checked on 10 October 2026: WHO: Hepatitis B; NHS: Hepatitis B; CDC: Hepatitis B Basics.