The main causes of Hepatitis B are sexual contact and injection drug use. The infection is spread when your mouth, vagina, or anus comes into contact with your partner’s sexual fluids. Sexual fluids include ejaculate, vaginal fluid, and anal fluid. Hepatitis B can also be spread through non-sexual activities that put you into contact with someone else’s blood, such as sharing injection drug equipment, tattoo needles or piercings, toothbrushes, nail clippers, razors or medical procedures with equipment that is not cleaned properly. A mother can also pass Hepatitis B onto a child through birth.