Hepatitis B is an infection of the liver caused by a virus. Often, there are no symptoms. It is the only STD that can be prevented by a vaccine.
Treatment includes rest, eating a healthy diet and avoiding alcohol.
They usually appear within two to six months after contact. Some people carry the hepatitis B virus for the rest of their lives and unknowingly pass it to their sex partners. Most people recover, but few have serious problems later on, such as permanent liver disease, including cancer of the liver. The hepatitis B virus is spread through infected blood and saliva. It can also be passed from an infected mother to her baby during childbirth.