What is hepatitis A?

Hepatitis refers to inflammation of the liver caused by exposure to toxins, alcohol misuse, immune diseases, or infection. Viruses cause the majority of cases of hepatitis.
Hepatitis A is a type of hepatitis that results from infection by the hepatitis A virus (HAV). This is an acute (short-term) type of hepatitis, which usually requires no treatment.
According to the World Health Organization (WHO)Trusted Source, 1.4 million cases of hepatitis A occur around the world each year. This highly contagious form of hepatitis can be spread through contaminated food or water. It generally isn’t serious and usually causes no long-term effects. A hepatitis A infection usually goes away on its own.

What are the symptoms of hepatitis A?

Children under the age of 6 typically show no symptoms when they contract the virus. Older children, teens, and adults usually develop mild symptoms, which can include:
  • flu-like symptoms (fever, fatigue, body aches)
  • abdominal pain (especially in the right upper quadrant)
  • light-colored stool
  • dark urine
  • loss of appetite
  • unexplained weight loss
  • jaundice (yellowing of skin or eyes)
Symptoms usually appear 15 to 50 days after you contract the virus.

What causes hepatitis A and how is it contracted?

People develop hepatitis A infection after contracting HAV. This virus is typically transmitted by ingesting food or liquid contaminated with fecal matter that contains the virus. Once transmitted, the virus spreads through the bloodstream to the liver, where it causes inflammation and swelling.
In addition to transmission from eating food or drinking water containing HAV, the virus can also be spread by close personal contact with an infected person. HAV is contagious, and a person who has hepatitis A can easily pass the disease to others living in the same household.
You can contract hepatitis A by:
  • eating food prepared by someone with the hepatitis A virus
  • eating food handled by preparers who don’t follow strict hand-washing routines before touching food that you eat
  • eating sewage-contaminated raw shellfish
  • not using condoms when having sex with someone who has the hepatitis A virus
  • drinking polluted water
  • coming in contact with hepatitis A-infected fecal matter
If you contract the virus, you will be contagious two weeks before symptoms even appear. The contagious period will end about one week after symptoms appear.

Who is at risk of getting hepatitis A?

Hepatitis A is usually spread from person to person, making it highly contagious. However, certain factors can increase your risk of contracting it, including:
  • living in (or spending an extended time in) an area where hepatitis A is common, including most countries with low sanitation standards or a lack of safe water
  • injecting or using illegal drugs
  • living in the same household as someone who is hepatitis A-positive
  • having sexual activity with someone who is hepatitis A-positive
  • being HIV-positive
The WHOTrusted Source reports that more than 90 percent of children living in countries where there are low sanitation standards will have had a hepatitis A infection by age 10.

How is it tested for and diagnosed?

After you discuss your symptoms with your doctor, they may order a blood test to check for the presence of a viral or bacterial infection. A blood test will reveal the presence (or absence) of the hepatitis A virus.
Some people have only a few symptoms and no signs of jaundice. Without visible signs of jaundice, it’s hard to diagnose any form of hepatitis through a physical examination. When symptoms are minimal, hepatitis A can remain undiagnosed. Complications due to a lack of diagnosis are rare.

Are there complications from hepatitis A?

In extremely rare cases, hepatitis A can lead to acute liver failure. This complication is most common in older adults and people who already have chronic liver disease. If this occurs, you will be hospitalized. Even in cases of liver failure, a full recovery is likely. Very rarely is a liver transplant required.