What it means
Hepatitis B is a virus that infects the liver. It can cause short-term illness, and in some people a long-term infection. It is a common cause of liver disease worldwide.
How it spreads
Through blood and certain body fluids:
- Sexual contact
- Shared needles, equipment or razors
- From a pregnant parent to a baby
- Needlestick injuries
- Tattoos or piercings with unsterilised equipment
It does not spread through sharing food, cutlery, toilets, hugs, coughing, sneezing or mosquito bites.
What can vary
Most people have no symptoms, particularly as adults. When symptoms appear — often weeks to months after infection — they may include tiredness, nausea, abdominal pain, dark urine, pale stools, fever and sometimes yellowing of the skin or eyes.
Some people clear the virus naturally. Others develop chronic infection, which needs long-term monitoring. Either way, many people with chronic infection live well with it under medical care.
Possible explanations
Testing is with blood tests: one to see whether you have been exposed, and one to see whether the virus is currently active in your blood. Vaccination status is also checked, since prior vaccination changes what the tests mean.
Treatment: acute infection is usually supported rather than treated directly. Chronic infection is managed with antiviral medication, and in many people this is highly effective.
Prevention
The hepatitis B vaccine is highly effective and provides long-lasting protection. In many countries it is given routinely in infancy or childhood. If you were not vaccinated, ask about it — it is especially worth discussing if you have partners who have hepatitis B, or if you may need blood tests or piercings.
Warning signs
- Yellowing of the skin or eyes, very dark urine, pale stools, or severe abdominal pain — liver problems needing prompt assessment.
- Possible exposure to blood or needles — post-exposure vaccination works best within hours, so this is urgent.
- Any new, persistent symptoms in someone who knows they have chronic hepatitis B.
What to do next
Get tested if you have been exposed, are unsure about your vaccination status, or have had blood exposure.
If you are vaccinated, you are very well protected. If you are not sure, checking is quick and the answer is genuinely useful.
Self-care
No self-care cures hepatitis B.
What you can do: avoid sharing razors, toothbrushes or needles; use barrier protection; avoid sharing cups or eating utensils if you are unsure of someone’s status; and if you have chronic infection, keep up with liver monitoring appointments, which is the single best thing you can do for your long-term health.
Alcohol is worth discussing with your clinician if you have liver infection.
When to seek help
Routine: testing, and checking vaccination status.
Prompt: jaundice, dark urine, or persistent fatigue with known infection.
Emergency: possible blood or needlestick exposure in the last hours — ask today about post-exposure vaccination.
How to talk about it
“I don’t know if I’ve been vaccinated for hepatitis B.”
“I was exposed to blood and I need to know what to do.”
“I have chronic hepatitis B and I’m overdue a check.”
Myths and stigma
“Hepatitis B is like hepatitis C.” They are different viruses with different transmission routes, different tests, and different treatments. Hepatitis B has a highly effective vaccine; hepatitis C does not.
“Only people from certain countries get it.” Hepatitis B is widespread in every region. Testing is not about where someone is from or who they are.
“Living with someone who has it is risky.” Transmission requires specific exposure. Sharing food, cups, cutlery, toilets and rooms does not spread hepatitis B.
Related articles
Sources
Public sources are linked so you can read the detail rather than take this site’s word for it. None of this has yet been reviewed by a qualified clinician — see how we handle medical review.
References
Where this comes from
Linked so you can check it against a recognised public health source rather than take this site's word for it.
- Hepatitis B — WHO World Health Organization (opens in a new tab)
- Hepatitis B — CDC US Centers for Disease Control and Prevention (opens in a new tab)
These are public sources from recognised health organisations, linked so you can read the detail rather than take this site's word for it. Reading them does not tell you whether any of it applies to you, and none of these articles has yet been reviewed by a qualified clinician. How we handle sourcing and review.