Hepatitis C is a viral infection that primarily affects the liver, causing inflammation, damage, and potential long-term complications. The virus, known as HCV, replicates within liver cells, leading to chronic infection in most cases.
The hepatitis C virus enters the bloodstream and travels to the liver, where it infects hepatocytes-the primary cells responsible for detoxification, protein synthesis, and metabolism. The virus replicates inside these cells, damaging them and triggering an immune response.
Over time, chronic inflammation can lead to fibrosis (scarring) and cirrhosis (severe scarring), impairing liver function. According to the Centers for Disease Control and Prevention (CDC), about 50% of people with chronic hepatitis C develop cirrhosis within 10-30 years.
There are six genotypes of hepatitis C, each with slightly different characteristics. Genotype 1 is the most common worldwide, while genotype 3 is associated with a higher risk of severe liver disease and liver cancer.
| Genotype | Prevalence | Notes |
|---|---|---|
| 1 | Most common globally | Resistant to some older treatments |
| 2 | Less common | Responds well to treatment |
| 3 | Common in Asia and parts of Europe | Linked to steatosis (fatty liver) |
The liver's role in processing nutrients, filtering toxins, and producing bile makes it a prime target for hepatitis C. Unlike other organs, the liver has limited regenerative capacity, and repeated damage from the virus can overwhelm its repair mechanisms.
One non-obvious fact: hepatitis C can also affect the immune system, leading to extrahepatic manifestations such as cryoglobulinemia-a condition where abnormal proteins in the blood cause inflammation in joints and blood vessels.
Many people confuse hepatitis C with other forms of hepatitis, such as hepatitis B or hepatitis A. Unlike hepatitis A, which is usually short-lived and resolves on its own, hepatitis C often becomes chronic. Hepatitis B, while also affecting the liver, is caused by a different virus (HBV) with distinct transmission routes and treatments.
Another misconception is that hepatitis C only affects people who inject drugs. While injection drug use is a major risk factor, the virus can also spread through blood transfusions (before 1992), unsterilized medical equipment, and during birth.
In my work, I've seen cases where patients with undiagnosed hepatitis C presented with fatigue, joint pain, and mild jaundice-symptoms often attributed to aging or stress. A simple blood test revealed elevated liver enzymes, leading to further testing and confirmation of HCV infection. Early diagnosis and treatment with direct-acting antivirals (DAAs) can cure over 95% of cases, preventing long-term liver damage.