There are five main types of viral hepatitis, labeled A through E. Each is caused by a different virus, spreads differently, and poses different risks to your health. Beyond these five, hepatitis can also result from non-viral causes like heavy alcohol use, certain medications, and autoimmune conditions. The word “hepatitis” simply means inflammation of the liver, so while the viral forms get the most attention, the term covers a broader range of conditions than most people realize.
The Five Types of Viral Hepatitis
The five recognized types are hepatitis A, B, C, D, and E. They range from short-lived infections that resolve on their own to chronic diseases that can quietly damage the liver over decades. Together, viral hepatitis kills roughly 3,500 people every day worldwide, according to the World Health Organization. Here’s what sets each type apart.
Hepatitis A: Spread Through Food and Water
Hepatitis A spreads through the fecal-oral route, meaning you catch it by ingesting something contaminated with the virus. This can happen through close contact with an infected person, sexual contact, or consuming contaminated food or water. It tends to cause outbreaks in areas with poor sanitation.
The good news is that hepatitis A does not become chronic. Your body clears the virus on its own, and once you’ve recovered, you’re immune for life. A safe and effective vaccine is available and widely recommended for children and travelers to high-risk areas.
Hepatitis B: Blood, Birth, and Body Fluids
Hepatitis B is transmitted through blood, semen, and other body fluids. The most common routes are birth from an infected mother, sexual contact, and sharing needles or syringes. The virus is highly concentrated in blood, making even small exposures risky.
What makes hepatitis B particularly dangerous is its potential to become chronic, especially when contracted early in life. Infants infected at birth have about a 90% chance of developing a lifelong infection, while most healthy adults clear the virus within six months. Chronic hepatitis B can lead to cirrhosis and liver cancer over time.
Vaccination is the most effective protection. Multiple FDA-licensed vaccines are available, and studies show immunity lasts at least 30 years when vaccination begins in infancy. Hepatitis B vaccines are now part of the routine childhood immunization schedule in most countries.
Hepatitis C: The Quiet Chronic Infection
Hepatitis C spreads primarily through direct blood-to-blood contact, most commonly by sharing contaminated needles or syringes used for injecting drugs. Unlike hepatitis B, there is no vaccine for hepatitis C.
The defining feature of hepatitis C is how often it becomes chronic. Many people have no symptoms for years or even decades while the virus slowly damages their liver. The major breakthrough in recent years has been the development of oral antiviral treatments that cure more than 95% of cases in just 8 to 12 weeks. A person is considered cured when the virus is undetectable in their blood 12 weeks after finishing treatment. This makes hepatitis C one of the few chronic viral infections that modern medicine can reliably eliminate.
Hepatitis D: Only With Hepatitis B
Hepatitis D is unique among the five types because it cannot infect you on its own. It’s known as a “satellite virus,” meaning it requires the hepatitis B virus to replicate. You can only get hepatitis D if you already have, or simultaneously contract, hepatitis B.
When someone catches both viruses at the same time, it’s called coinfection. When hepatitis D develops in someone who already has chronic hepatitis B, it’s called superinfection. Superinfection tends to be more severe and accelerates liver damage. Because hepatitis D depends entirely on hepatitis B, the hepatitis B vaccine indirectly protects against hepatitis D as well.
Hepatitis E: Common Worldwide, Often Overlooked
Hepatitis E has four major genotypes that infect humans, and they behave quite differently depending on where in the world you are. Genotypes 1 and 2 are the most common in Africa and parts of Asia, where they spread through contaminated drinking water and can trigger large outbreaks affecting thousands of people at once.
Genotypes 3 and 4 are primarily animal viruses that occasionally jump to humans, typically through eating undercooked or raw meat, particularly pork and game. These zoonotic strains are more common in higher-income countries. Like hepatitis A, most hepatitis E infections resolve without treatment, though the infection can be particularly dangerous for pregnant women. No widely available vaccine exists in most countries.
What About Hepatitis F and G?
You may have come across references to hepatitis F or G. Hepatitis F was proposed in the 1990s but was never confirmed as a distinct virus and is not recognized today. Hepatitis G virus (also called GBV-C) does exist and can cause chronic infection in the bloodstream, but there is no conclusive evidence that it causes meaningful liver disease. The liver doesn’t appear to be a significant site where the virus replicates. For practical purposes, neither hepatitis F nor G is considered a clinical concern, which is why the medical community focuses on the five established types.
Non-Viral Causes of Hepatitis
Not all hepatitis comes from a virus. Your liver can become inflamed from several non-infectious causes, and these forms of hepatitis are more common than many people think.
Alcoholic hepatitis develops from sustained heavy drinking. For women, consuming 3 to 4 drinks a day over six months or longer raises the risk. For men, the threshold is slightly higher at 4 to 5 drinks a day over the same period. The condition can range from mild inflammation to life-threatening liver failure.
Toxic hepatitis results from exposure to certain medications, herbal supplements, or poisons. Common over-the-counter painkillers like acetaminophen (Tylenol) can damage the liver when taken in high doses, combined with alcohol, or used repeatedly by someone who already has liver disease. Even standard doses can become harmful under those circumstances.
Autoimmune hepatitis occurs when the immune system mistakenly attacks liver cells. It’s a chronic condition that requires ongoing treatment to control inflammation and prevent scarring.
How the Types Compare at a Glance
- Hepatitis A: Spreads through contaminated food/water. No chronic form. Vaccine available.
- Hepatitis B: Spreads through blood and body fluids. Can become chronic. Vaccine available.
- Hepatitis C: Spreads through blood contact. Often chronic. No vaccine, but curable with treatment.
- Hepatitis D: Only occurs with hepatitis B. Hepatitis B vaccine provides indirect protection.
- Hepatitis E: Spreads through contaminated water or undercooked meat. Rarely chronic. No widely available vaccine.
The five viral types differ enormously in how they spread, how long they last, and how they’re treated. Knowing which type you’re dealing with matters because the prevention strategies, risks, and treatment options are completely different for each one.