Hepatitis C virus (Hep C) is a disease that infects the liver. Hep C can cause lifelong infection, and over time it can cause fibrosis (mild to moderate liver scarring), cirrhosis (serious liver scarring), liver cancer, liver failure and death. Hep C spreads when blood from a person with the Hep C virus enters the body of someone who is not infected. Most people become infected with Hep C by sharing needles or other paraphernalia to inject drugs.
Hep C is common among people living with HIV. In the United States, approximately 25 percent of people living with HIV are co-infected with Hep C.