How chronic hepatitis B is transmitted

It is not spread by hugging, coughing, sneezing, sharing meals, or ordinary social contact. Knowing the actual routes helps protect others without isolating the person who has hepatitis B.

Transmission can occur from a pregnant person to their baby around delivery, through sex without barrier protection, and when needles or injection equipment are shared. Blood exposure may also happen through unsterile tattooing or piercing equipment, needlestick injuries, or shared personal items contaminated with small amounts of blood.

The virus can remain transmissible even when the infected person feels well. Saliva is not an everyday route: sharing cups or cutlery and casual kissing do not spread hepatitis B. Breastfeeding is generally compatible with appropriate newborn prevention, though cracked or bleeding nipples need individual advice.

Sexual partners and household members should have hepatitis B testing and vaccination if they are not already immune. Use condoms until a clinician confirms a partner is protected. Never share needles, razors, toothbrushes, glucose-testing equipment, or anything that may carry blood; cover cuts and clean blood spills safely.

Tell dentists and healthcare teams about the infection so they can plan care, although standard infection-control precautions protect both patients and staff. Pregnant people with hepatitis B need coordinated maternity and liver care so that antiviral assessment and newborn preventive treatment can be arranged.

Seek medical advice promptly after a needlestick, shared-needle event, sexual exposure, or direct contact between infected blood and broken skin, eyes, or mouth. Do not wait for symptoms, because preventive care works best when assessed soon after exposure. Anyone who develops yellow skin or eyes, dark urine, pale stools, repeated vomiting, or severe abdominal pain after a possible exposure should receive urgent clinical assessment.

Ask who among your close contacts should be tested, whether their vaccination course is complete, and whether a recent exposure requires hepatitis B vaccine or hepatitis B immune globulin. If you are pregnant, ask how your viral load affects delivery planning and what the baby should receive immediately after birth.