Hepatitis B is caused by the Hepatitis B virus (HBV) and spreads by contact with an infected person's blood, semen or other body fluid. An infected woman can give Hepatitis B to her baby at birth.
If you get HBV, you may feel as if you have the flu. You may also have jaundice, a yellowing of skin and eyes, dark-colored urine and pale bowel movements. Some people have no symptoms at all.