Chronic hepatitis C (HCV) is a long-term viral infection of the liver that persists for six months or more after the initial exposure. An estimated 50 million people worldwide are living with it, and roughly 240,000 die each year from its complications. Most people with chronic HCV have no symptoms for years or even decades, which is why it’s often called a “silent” infection. The good news: modern treatments cure more than 95% of cases.
How Acute HCV Becomes Chronic
When you first contract hepatitis C, the infection is considered “acute” for the first six months. During this window, some people’s immune systems clear the virus on their own without treatment. But the majority don’t. When the virus remains detectable in your blood beyond that six-month mark, the infection is reclassified as chronic. At that point, the virus is unlikely to go away without treatment, and it continues replicating in your liver indefinitely.
How It Spreads
Hepatitis C is a bloodborne virus. The most common route of transmission, by a wide margin, is sharing needles, syringes, or other equipment used to inject drugs. This includes people who injected drugs in the past, even once.
Less common routes include:
- Receiving a blood transfusion or organ transplant before July 1992 (when routine screening began in the U.S.)
- Receiving clotting factor concentrates made before 1987
- Long-term hemodialysis
- Birth from a mother with hepatitis C
- Sexual contact, particularly among people with HIV
- Tattoos or piercings done in unregulated settings
- Sharing razors, toothbrushes, or other personal items contaminated with blood
- Needlestick injuries in healthcare settings
You cannot get hepatitis C from casual contact, hugging, sharing food, or breastfeeding.
Why Most People Don’t Know They Have It
Most people with chronic HCV are completely asymptomatic. When symptoms do appear, they tend to be vague: fatigue, general malaise, joint pain, or muscle aches. These are easy to attribute to aging, stress, or other conditions. Many people carry the virus for 20 or 30 years before liver damage becomes severe enough to cause noticeable problems. This is why screening is so important.
The CDC recommends that all adults aged 18 and older get tested at least once in their lifetime. Pregnant women should be screened during each pregnancy. Testing involves a simple blood draw. The first test checks for antibodies, which tell you whether your body has ever encountered the virus. A positive antibody result doesn’t necessarily mean you’re currently infected. You could have cleared the virus naturally or been treated in the past. A second test, called an RNA test, checks for the virus itself. If the RNA test comes back positive, you have an active infection.
What Happens to Your Liver Over Time
Chronic HCV causes gradual scarring of the liver, a process called fibrosis. Doctors grade fibrosis on a scale from F0 to F4. At F0, there’s no scarring. At F1, scarring is mild. F2 and above is considered significant fibrosis, meaning the damage is starting to affect how well the liver functions. F3 and F4 are classified as advanced fibrosis, and F4 is cirrhosis, where extensive scarring has replaced healthy tissue throughout the liver.
Not everyone with chronic HCV progresses to cirrhosis, and the timeline varies enormously. Factors like alcohol use, obesity, co-infection with HIV or hepatitis B, and age at the time of infection all influence how quickly scarring develops. Some people reach cirrhosis within 20 years; others never do.
Once cirrhosis is established, the risk of liver cancer rises significantly. People with HCV-related cirrhosis develop liver cancer at an annual rate of roughly 1% to 8%, with an average around 3.5% per year. This is why people with advanced liver disease need regular imaging surveillance even after the virus has been treated.
Effects Beyond the Liver
Hepatitis C isn’t purely a liver disease. The virus triggers immune responses that can affect organs and systems throughout the body. The most well-known of these is a condition where abnormal proteins in the blood cause inflammation in small blood vessels, leading to skin rashes, joint pain, nerve damage, and kidney problems.
Other conditions linked to chronic HCV include thyroid disease, type 2 diabetes, kidney inflammation, a blistering skin condition triggered by sun exposure, flat-topped skin lesions in the mouth or on the body, low platelet counts, dry eyes and dry mouth, decreased bone density, and cognitive difficulties sometimes described as “brain fog.” Many of these improve or resolve entirely once the virus is cleared with treatment.
How Chronic HCV Is Treated
Treatment has transformed over the past decade. Older regimens involved weekly injections and months of severe side effects, with cure rates well under 50%. Current treatments are oral pills taken for 8 to 12 weeks, and they cure the vast majority of patients.
In clinical trials, cure rates consistently exceed 95% across all major viral subtypes. For some patient groups, rates reach 99%. “Cure” in this context means the virus is undetectable in your blood 12 weeks after finishing treatment, a benchmark called sustained virologic response. Once achieved, the infection is gone permanently in virtually all cases.
Treatment works for people at every stage of liver disease, though those with cirrhosis may need a longer course and closer monitoring. Even after a cure, people who already had significant liver scarring still need ongoing follow-up, because the risk of liver cancer doesn’t drop to zero once the virus is cleared. For people treated before significant damage occurs, life expectancy returns to normal.
Who Should Get Tested
Beyond the universal one-time screening for all adults, certain groups face higher risk and may need repeat testing. These include people who currently inject drugs or have done so in the past, people living with HIV, healthcare workers who’ve had a needlestick exposure, anyone who received blood products before 1992, and people born to mothers with hepatitis C. If you fall into any of these categories and haven’t been tested, a single blood draw is all it takes to find out.