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What Is Hepatitis?
The liver is one of the body's powerhouses. It helps process nutrients and metabolizes medication. The liver also helps clear the body of toxic waste products.
The word hepatitis (pronounced: heh-puh-tie-tus) means an inflammation of the liver, and it can be caused by one of many things - including a bacterial infection, liver injury caused by a toxin (poison), and even an attack on the liver by the body's own immune system.
Although there are several forms of hepatitis, the condition is usually caused by one of three viruses: hepatitis A, hepatitis B, or hepatitis C virus. Some hepatitis viruses can mutate, which means they can change over time and can be difficult for the body to fight. In some cases, hepatitis B or C can destroy the liver. The patient then will need a liver transplant to survive, which is not always available or successful.


Hepatitis A

The hepatitis A virus is transmitted through the feces (poop) of infected individuals. People usually get hepatitis A by eating food or drinking water that's been contaminated with feces. Although that sounds disgusting, hepatitis A is actually considered to be less destructive than some other hepatitis viruses. That's because, unlike some other types, it rarely leads to permanent liver damage. Within a few weeks, the symptoms will have gone away on their own and the hepatitis A virus will no longer be in your system. Once a person has recovered from a hepatitis A infection, that person has immunity to the virus, meaning he or she will probably never get it again. People are also protected against hepatitis A if they've been vaccinated for it.

Hepatitis B

Hepatitis B is a more serious infection. It may lead to a condition called cirrhosis (permanent scarring of the liver) or liver cancer, both of which cause severe illness and even death. Hepatitis B is transmitted from person to person through blood or other body fluids.
In the United States, the most common way people get infected with hepatitis B is through unprotected sex with a person who has the disease. People who inject drugs (in other words, use a needle) also are at risk of becoming infected because it's likely that the needles they use will not have been sterilized. In fact, up to one in every 50 people living in the United States will become infected with the hepatitis B virus - and the risk of infection is greater among people who have unprotected sex or inject drugs.
That's scary stuff given that, as yet, there's no effective cure for hepatitis B. In most cases, a teen who gets hepatitis B will recover from the disease and may develop a natural immunity to future hepatitis B infections. But some people will have the condition forever. Medications can help some people with hepatitis B get rid of the virus.

Hepatitis C

Like hepatitis B, hepatitis C can lead to cirrhosis or liver cancer. Also like hepatitis B, hepatitis C is transmitted from person to person through blood or other body fluids.
Hepatitis C is the most serious type of hepatitis - it's now one of the most common reasons for liver transplants in adults. Every year, thousands of people in the United States die from the virus. And there's no cure and no vaccine.
An estimated 4.1 million Americans are currently infected with the virus. The most common way people become infected is through sharing drug paraphernalia such as needles and straws. People also get hepatitis C after having unprotected sex with an infected partner. Before 1990, many people got hepatitis C through blood transfusions, but better blood screening and handling procedures now mean that this rarely happens.
The medications currently used to treat hepatitis C are effective in controlling the disease in some people. However, hepatitis C treatments are not very easy to take, especially because some require frequent injections.

What Are the Signs and Symptoms?
Hepatitis infection causes inflammation of the liver, which means that the liver becomes swollen and damaged and begins losing its ability to function. People with hepatitis often get symptoms similar to those caused by other virus infections, such as weakness, tiredness, and nausea. Because the symptoms of hepatitis are similar to other conditions, it's easy for a person who has it to confuse it with another illness. In addition, people with hepatitis A may not show any symptoms of the infection, so the infection can go undiagnosed. People with hepatitis B or C infection also may not show symptoms right away, but can develop health problems from the infection many years later. Even when infected people don't have any symptoms, they can still pass the disease on to others.