Hepatitis B

Also called Hep B or HBV

Hepatitis B is a liver infection caused by a virus that spreads through blood and body fluids, for example during sex without a condom, by sharing needles, or from mother to baby at birth. Most adults clear the virus within a few months, but some people, especially babies and children, develop long-term (chronic) infection.

Last updated Nov 9, 2026

What it is

Chronic hepatitis B can lead to liver scarring (cirrhosis) and liver cancer, so it needs regular monitoring. Antiviral medicines can keep it under control.

The hepatitis B vaccine is part of routine childhood vaccinations and is offered to people at higher risk.

Common signs

  • Often no symptoms
  • Flu-like symptoms and tiredness
  • Tummy pain
  • Yellow skin or eyes (jaundice)
  • Dark pee and pale poo

How it is usually diagnosed

  • Blood tests for hepatitis B markers and viral load
  • Liver function tests
  • Liver scans such as ultrasound or elastography

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Hepatitis B markers and viral load over time
  • Liver function results
  • Liver scan reports
  • Hepatology letters

Questions to ask your doctor

  • Is my infection acute or chronic?
  • Do I need antiviral treatment?
  • Should my partner and family be tested or vaccinated?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Confusion, vomiting blood, a swollen tummy or severe drowsiness: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources