How Dangerous Is Hepatitis C? Understanding the Disease, From Prevention to Treatment
Today, as many as 71 million people around the world are living with chronic hepatitis C.
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Today, as many as 71 million people around the world are living with chronic hepatitis C. In Thailand, statistics show roughly 2 million people with chronic infection, plus another 700,000 or so who are infected with the hepatitis C virus. This virus is a leading cause of cirrhosis and liver cancer, and at present there is no vaccine that can prevent hepatitis C with 100% effectiveness. As a result, people who are infected have a high chance of easily passing the virus on to others. Yet most people with hepatitis C are unaware that they have been infected, because the disease shows no clear symptoms in its early stages; they only realize something is wrong once the liver begins to deteriorate.
How Hepatitis C Infection Develops
Once the hepatitis C virus enters the body, it settles in the liver and multiplies, steadily increasing in number. In the early stage of infection, the person develops acute hepatitis but shows no clear symptoms of the disease. Without timely treatment, the infection can eventually progress to cirrhosis.
Types of Hepatitis C Virus
The hepatitis C virus (HCV) has six main strains, known as genotypes, which can be further divided into 1a, 1b, 1c; 2a, 2b, 2c; 3a, 3b; 4a, 5a, and 6a. Each genotype is distributed differently across regions of the world. The types found most often in Thailand are genotypes 1 and 3. Because of this, the treatment approach differs for each type of hepatitis C, so that care can be tailored to be as appropriate and effective as possible.
Symptoms of Hepatitis C
Acute Hepatitis C
People infected with hepatitis C at this stage usually show no clear symptoms. Only a small number develop symptoms within a few weeks of the virus entering the body. Some people recover on their own, while in some people with a weak immune system the virus can remain in the body for around 10 to 30 years and eventually progress to the chronic stage. Some people in the acute stage may experience the following symptoms:
- Fatigue and general discomfort
- High fever
- Abdominal pain
- Loss of appetite
- In some cases, jaundice-like signs such as yellowing of the skin and eyes
- Dark-colored urine
- Weight loss
- Aching joints and muscles
Chronic Hepatitis C
At this stage, clear symptoms appear only once the liver has been severely damaged. Most people develop symptoms after carrying the virus for about 10 years or more. Without prompt treatment, a person faces a high risk of serious liver disease. People in the chronic stage may have the following symptoms:
- Feeling fatigued
- Fever and malaise
- Joint pain and muscle pain
- Abnormal swelling of the legs
- Abdominal pain
- Weight loss
- Dark-colored urine
- Itchy skin rashes
- Bruising on the body
- A tendency to bleed easily
- Mood swings
How Hepatitis C Is Transmitted
- Contact with the blood or bodily fluids of someone infected with hepatitis C
- Sharing needles or syringes (among people who inject drugs)
- People living with HIV or AIDS
- People who engage in risky sexual behavior
- Having sex without a condom
- Having sex with someone who has chronic hepatitis C
- Receiving blood through medical equipment that may be contaminated
- People undergoing hemodialysis
- People whose test results indicate hepatitis
Diagnosing Hepatitis C
When a person has abnormal symptoms that resemble hepatitis C infection, the doctor makes a diagnosis through a blood test to analyze whether the liver is inflamed. This may include an anti-HCV test to measure the amount of virus in the blood, testing to identify the strain (genotype) of the hepatitis C virus, a Polymerase Chain Reaction (PCR) test, and liver function tests for AST and ALT. In some people, a liver biopsy may also be needed.
Treating Hepatitis C
Hepatitis C can be completely cured. Treatment depends on the type of hepatitis C that is detected, and the doctor decides on medication and care according to each person's condition. This can include injections combined with oral antiviral drugs. If tests show that the person has an acute-stage infection, the doctor will monitor the symptoms and may determine that treatment is not necessary. If the person is found to have a chronic-stage infection, the doctor will provide treatment that takes into account the severity of the symptoms as well as the person's overall physical condition.
Complications of Hepatitis C
People who have chronic hepatitis C for many years may develop complications, such as:
- People who have had hepatitis C for 20 to 30 years are at risk of cirrhosis, a condition in which the liver is damaged to the point that it no longer works properly.
- People who do not receive proper treatment may be at high risk of liver cancer.
- If a person has cirrhosis, it can progress to a severe stage and lead to liver failure.
Advice for People with Hepatitis C
People with hepatitis C can live a full, healthy life and should try to reduce anxiety and stress. At the same time, it is important to follow the doctor's advice closely — for example, eating nutritious food, getting enough rest, exercising regularly, avoiding alcohol, staying away from behaviors that risk spreading the virus or picking up other infections, and avoiding foods and medicines that are harmful to the liver. Above all, people with hepatitis C must keep their scheduled appointments with the doctor on a regular basis.
Preventing Hepatitis C
- Wear a condom every time you have sex
- Avoid frequently changing sexual partners
- Avoid sharing sharp objects or needles with others
- Avoid contact with the blood or bodily fluids of people who are infected
- Wear gloves when in contact with blood or bodily fluids
- Avoid getting tattoos or ear piercings at places you cannot trust
- Get screened for hepatitis C regularly
If hepatitis C is left untreated, about 75–85% of people go on to develop chronic hepatitis, which can lead to cirrhosis and liver cancer. Because this disease often shows no clear symptoms, anyone who suspects they may have been infected with hepatitis C should see a doctor right away for testing and diagnosis — hepatitis C can be treated if it is caught early.
Verified references
Links and relevance to the article’s main topic were reviewed on 13 August 2026. Each source supports only the scope stated in the original document and does not replace personalised medical, legal, or service advice.
- WHO: Hepatitis C fact sheet Accessed 13 August 2026
