July 28th is World Hepatitis Day, an annual reminder to raise awareness about a condition that affects hundreds of millions of people worldwide and remains one of the most underdiagnosed infectious disease challenges in global health.
Most people have heard the word hepatitis. Far fewer understand what it actually means, how many different forms it takes, or whether they might be at risk without knowing it.
What Hepatitis Actually Is
Hepatitis is inflammation of the liver. The liver is one of the body's most essential organs, it filters toxins from the blood, produces proteins needed for clotting, supports digestion, and plays a central role in metabolism. When the liver becomes inflamed, all of those functions are affected.
Hepatitis can be caused by viral infections, by heavy alcohol use, by certain medications, and by autoimmune conditions where the body's immune system mistakenly attacks liver tissue. The most common cause worldwide is viral hepatitis, which is why the five main hepatitis viruses, A, B, C, D, and E, receive so much attention from public health organizations.
Some forms of hepatitis are short-lived and resolve on their own. Others become chronic, persisting for months or years and potentially progressing to serious liver damage including cirrhosis, liver failure, or liver cancer if left untreated. The type of hepatitis, how it is transmitted, and how the individual's body responds all determine the outcome.
The Five Main Types of Hepatitis
Hepatitis A
Hepatitis A is caused by the hepatitis A virus, which lives in the feces of infected people. It spreads primarily through contaminated food or water and through close contact with someone who is infected. Outbreaks most commonly occur in settings with inadequate sanitation, though cases occur in all parts of the world including the United States.
Symptoms typically appear two to six weeks after exposure and can include fatigue, nausea and vomiting, abdominal discomfort particularly on the upper right side where the liver sits, loss of appetite, low-grade fever, dark urine, pale or clay-colored stools, joint pain, and jaundice, the yellowing of the skin and whites of the eyes that is a hallmark of liver involvement.
The reassuring thing about hepatitis A is that it is almost always self-limiting. The body clears the infection on its own without long-term liver damage in the vast majority of cases. It can make people quite ill for several weeks but does not become chronic.
A highly effective vaccine is available. A single dose provides protection for about 95 percent of adults who receive it, and two doses provide nearly 100 percent protection. The hepatitis A vaccine is recommended as part of routine childhood immunizations and for adults traveling to certain countries.
Hepatitis B
Hepatitis B is transmitted through exposure to infected blood, semen, and other body fluids. The most common routes of transmission are unprotected sexual contact, sharing needles or other drug injection equipment, accidental needlestick injuries in healthcare settings, and transmission from mother to infant at birth or from an infected family member to a young child.
Unlike hepatitis A, hepatitis B can become a chronic infection. Most adults who are infected clear the virus on their own within six months. But infants and young children who are infected have a much higher likelihood of developing chronic hepatitis B, which is why vaccination early in life is so important.
Symptoms of hepatitis B can include fever, fatigue, muscle and joint pain, loss of appetite, nausea and vomiting, stomach pain, pale stools, dark urine, jaundice, and abdominal swelling. Many people with chronic hepatitis B have no symptoms at all, which is why screening through routine blood work is important for people with risk factors.
A safe and effective vaccine is available and is part of the standard childhood immunization schedule in the United States. Adults who were not vaccinated as children and who have risk factors for hepatitis B should talk to their doctor about getting vaccinated.
Hepatitis C
Hepatitis C is transmitted through contact with infected blood. The most common routes of transmission include sharing needles or drug injection equipment, receiving blood transfusions or organ transplants before 1992 when widespread screening of the blood supply began, and needlestick injuries in healthcare settings. Sexual transmission is possible but significantly less common than with hepatitis B.
Hepatitis C is one of the most important forms of hepatitis from a public health perspective because it frequently becomes chronic and can cause significant liver damage over years and decades, often with no symptoms until the disease is quite advanced. Many people living with chronic hepatitis C were infected decades ago without knowing it.
Symptoms when they do occur can include easy bruising or bleeding, fatigue, poor appetite, jaundice, dark urine, itchy skin, fluid accumulation in the abdomen, leg swelling, and in advanced cases confusion and slurred speech that indicate the liver is no longer functioning adequately.
There is currently no vaccine for hepatitis C. However, there are now highly effective antiviral medications that can cure hepatitis C in the vast majority of people who are treated. This makes screening and early identification genuinely life-changing, a curable infection that is found early is a fundamentally different situation from one that is found only after years of undetected liver damage.
The CDC recommends that all adults be screened for hepatitis C at least once, and that people with ongoing risk factors be screened more regularly.
Hepatitis D
Hepatitis D is caused by a virus that can only infect people who already have hepatitis B. It cannot be contracted independently. When someone with hepatitis B is also infected with hepatitis D, the combination tends to cause more severe liver disease than hepatitis B alone.
Transmission occurs through the same routes as hepatitis B, infected blood, sexual contact, and from mother to child.
Symptoms are similar to other forms of hepatitis and include jaundice, joint pain, abdominal pain, vomiting, loss of appetite, dark urine, and fatigue.
There is no standalone vaccine for hepatitis D, but because it requires hepatitis B to take hold, vaccination against hepatitis B also provides complete protection against hepatitis D. This is one of the many reasons the hepatitis B vaccine is so important.
Hepatitis E
Hepatitis E is similar to hepatitis A in that it is transmitted through contaminated food or water, particularly in areas with limited access to clean water and adequate sanitation. It is far more common in parts of Asia, Africa, the Middle East, and Central America than in the United States, though travel-related cases do occur.
Symptoms include fever, fatigue, loss of appetite, nausea, vomiting, abdominal pain, jaundice, dark urine, clay-colored stools, and joint pain. Like hepatitis A, it is usually self-limiting in healthy adults and does not become chronic.
The exception is in pregnant women, particularly those in their third trimester, for whom hepatitis E can be significantly more serious and is associated with higher rates of complications. Pregnant women traveling to regions where hepatitis E is common should take particular care with food and water safety.
A vaccine for hepatitis E exists but is not yet widely available outside of China. Prevention relies primarily on access to clean water and good food hygiene practices.
Who Is Most at Risk
Understanding risk factors helps people make informed decisions about vaccination, screening, and protective behaviors. Factors that increase the risk of hepatitis infection include:
- Travel to or residence in countries with high rates of hepatitis A or E, where water and food safety cannot always be guaranteed
- Unprotected sexual contact, particularly with multiple partners or with a partner whose hepatitis status is unknown
- Current or past injection drug use, even if infrequent
- Healthcare work involving exposure to blood and body fluids
- Being born to a mother with hepatitis B
- Having received blood transfusions or organ transplants before 1992
- Living with someone who has chronic hepatitis B or C
- Being born between 1945 and 1965, a generation that has significantly higher rates of hepatitis C due to exposures that occurred before widespread screening existed
Having one or more of these risk factors is not a reason for alarm but it is a reason to have a conversation with a doctor about appropriate screening and vaccination.
What Protects Against Hepatitis
Several straightforward practices reduce the risk of hepatitis transmission significantly.
Vaccination
Vaccination is the most powerful protective tool available for the types that have vaccines. Hepatitis A and B vaccines are safe, highly effective, and widely available. Getting vaccinated if not already protected is one of the most concrete steps anyone can take.
Safe Sex
Practicing safe sex including consistent condom use reduces the risk of sexual transmission of hepatitis B and to a lesser extent hepatitis C.
Safe Needle Usage
Never sharing needles, syringes, or any equipment used for drug injection is critical for preventing bloodborne transmission. This applies equally to any equipment that might come into contact with blood including razors and toothbrushes.
Clean food and Water
Being careful with food and water safety when traveling, choosing cooked foods, drinking bottled or purified water, and washing hands thoroughly before eating, reduces the risk of hepatitis A and E significantly.
Good Hand Hygiene
Washing hands consistently and correctly, particularly before preparing or eating food and after using the bathroom, is a basic but genuinely effective protective habit.
Regular Doctor Visits
Knowing your status is also protective. Routine blood work through an annual physical can screen for hepatitis B and C. People who do not know they are infected cannot access treatment, and for hepatitis C in particular, that treatment is now curative.
When to Schedule an Appointment with Your Doctor
Hepatitis is not a topic most people bring up proactively, but it is one that deserves a conversation at a routine checkup for anyone with risk factors or any concern about past exposures.
Symptoms worth discussing with a provider include unusual fatigue, jaundice, persistent abdominal discomfort particularly on the upper right side, dark urine, pale stools, or unexplained nausea. These are not specific to hepatitis alone, but they are the kinds of changes the liver makes visible when something is wrong.
And for people who simply want to know their status, which is a completely reasonable thing to want, a blood test is all it takes. The doctors at Northwest Family Clinics welcome these conversations as part of whole-person preventive care.
Frequently Asked Questions
What is the difference between hepatitis A, B, and C?
The three most common forms of hepatitis differ primarily in how they are transmitted and whether they can become chronic. Hepatitis A spreads through contaminated food and water, is almost always self-limiting, and has a highly effective vaccine. Hepatitis B spreads through blood and body fluids, can become chronic, and has a highly effective vaccine. Hepatitis C spreads primarily through blood, frequently becomes chronic, has no vaccine but is now curable with antiviral medications.
Can you get hepatitis without knowing it?
Yes, particularly with hepatitis B and C. Many people with chronic hepatitis B or C have no symptoms for years or even decades while the virus is silently damaging the liver. This is why routine screening through blood work is important for people with risk factors, and why the CDC recommends that all adults be screened for hepatitis C at least once.
Is hepatitis contagious?
The viral forms of hepatitis are contagious, but how contagious depends on the type. Hepatitis A and E spread through contaminated food and water. Hepatitis B and C spread through blood and body fluids. None of the hepatitis viruses spread through casual contact like hugging, sharing dishes, or being in the same room as an infected person.
Which types of hepatitis have vaccines?
Hepatitis A and hepatitis B both have safe and highly effective vaccines. Because hepatitis D can only infect people who already have hepatitis B, the hepatitis B vaccine also protects against hepatitis D. There is no widely available vaccine for hepatitis C or hepatitis E.
Should I be screened for hepatitis?
The CDC recommends that all adults be screened for hepatitis C at least once. Adults with specific risk factors for hepatitis B should also be screened. Routine blood work at an annual physical is an appropriate time to discuss whether hepatitis screening makes sense based on individual history and risk factors.
Can hepatitis be cured?
Hepatitis A and E typically resolve on their own without treatment. Hepatitis B can be managed with antiviral medications though it is not always fully cured. Hepatitis C is now curable in the vast majority of people with a course of antiviral medications, which represents one of the most significant advances in infectious disease treatment in recent decades.
What are the signs of hepatitis?
Common signs across most types of hepatitis include fatigue, nausea, abdominal discomfort particularly on the upper right side, dark urine, pale or clay-colored stools, and jaundice, a yellowing of the skin and the whites of the eyes. Many people with hepatitis, particularly chronic hepatitis B and C, have no symptoms at all, which is one reason screening matters.