Hepatitis C is an infectious disease that was only recognized in the late 1980s, caused by hepatitis C virus infection, mainly transmitted through blood, and its modes of transmission include: transfusion of blood products (mainly before the 1980s), sharing of needles for intravenous injection of drugs, the use of non-strictly sterilized cosmetic instruments for a variety of cosmetic surgeries, and unprotected sexual intercourse with patients with hepatitis C. Hepatitis C can also be transmitted from mother to child. Daily life and work contacts, such as shaking hands with a person with hepatitis C, courtesy hugs, eating together and working together will not be infected with hepatitis C virus. Ms. Shangguan’s Hepatitis C was caused by the use of unclean medical instruments during orthodontics and dental scaling. Hepatitis C is more insidious, most of the patients do not have any symptoms after acute infection, and the transaminase is generally not obvious, 15% of the patients can completely clear the virus and be cured, however, about 85% of the patients become chronically infected, of which 20% of the patients will develop cirrhosis after 20 years, and 3-4% of the patients will progress to liver cancer. It can be seen that the natural regression of hepatitis C is much worse than that of hepatitis B, so more attention should be paid to the treatment. It should be noted that only positive serum hepatitis C antibody cannot diagnose hepatitis C. If hepatitis C antibody is found to be positive, further testing of hepatitis C virus nucleic acid (HCV RNA) should be conducted, and only HCV RNA positivity can diagnose hepatitis C. Once hepatitis C is diagnosed, the patient should be diagnosed with hepatitis C. Once diagnosed with Hepatitis C, the patient should be actively treated with antiviral therapy, and at present, the only method of antiviral therapy is alpha-interferon combined with ribavirin, which is the internationally recognized gold standard, with a one-year course of treatment. There are two types of interferon: ordinary interferon and polyethylene glycol interferon. Ordinary interferon is injected subcutaneously every other day, and polyethylene glycol interferon is injected subcutaneously once a week. The advantages of interferon polyethylene glycol are that the frequency of injections is reduced due to less skin pain, fewer side effects, and better efficacy than regular interferon, except that it is expensive. Both interferon and ribavirin have different side effects, such as flu-like symptoms, inhibition of bone marrow hematopoiesis, destruction of red blood cells, hair loss, etc. You cannot have children while receiving antiviral treatment and for six months after stopping the drug. Therefore, antiviral treatment must be under the guidance of a specialist, with regular monitoring and adjustment of drug dosage if necessary. Unlike Hepatitis B, Hepatitis C can be cured to a large extent, and 70% of patients can be cured by applying the “888 principles”. The so-called “888 principle” means that interferon is used at 80% or more of the standard dose, ribavirin is used at 80% or more of the standard dose, and 80% of the expected course of treatment has been completed.