Hepatitis C is an anthroponotic viral disease with parenteral route of transmission. Infection is also possible through damaged skin and mucous membranes, but the most dangerous factor is transmission through blood. First of all, the virus affects the kidney, thyroid or pancreas, and then goes to the liver, causing cirrhosis or cancer. The complexity of diagnosis and treatment of hepatitis C includes that to a certain moment (up to several decades) it may be asymptomatic or have nonspecific symptoms similar to other chronic infections (asthenia, weakness, fatigue). Because of such ability to disguise in many other diseases hepatitis C is often called “gentle killer.”