Hepatitis A is a highly contagious, short-term liver infection caused by the hepatitis A virus. Hepatitis is an inflammation of the liver that can be contracted through unprotected sex, using contaminated needles, or other causes.
People who get hepatitis A may feel sick for a few weeks to several months but usually recover completely and do not have lasting liver damage. In rare cases, hepatitis A can cause liver failure and even death; this is more common in older people and in people with other serious health issues, such as chronic liver disease.
Symptoms include fatigue, nausea, abdominal pain, loss of appetite, and low-grade fever.