DefinitionHepatitis B is inflammation (irritation and swelling) of the liver due to the hepatitis B virus (HBV).Other types of hepatitis include:Hepatitis AHepatitis CHepatitis DSee also:Autoimmune hepatitisChronic persistent hepatitisDrug-induced hepatitisCauses, incidence, and risk factorsThe hepatitis B virus spreads through blood, semen, vaginal fluids, and other body fluids.Infection can occur if you have:Blood transfusionsContact with blood in health care settingsHad direct contact with the blood of an infected person by touching an open wound or being stuck with a needleHad unprotected sex with an infected personReceived a tattoo or acupuncture with contaminated instrumentsShared needles during drug useShared personal items (such as toothbrushes, razors, and nail clippers) with an i