The most common causes of hepatitis are viruses. Alcohol and drug abuse, chemical toxins, food contaminated with feces, and immune disorders can also cause hepatitis. So can diabetes, obesity, and metabolic syndrome.
When a virus causes hepatitis, it is called viral hepatitis. The hepatitis viruses A, B, and C commonly cause viral hepatitis. Hepatitis D is an uncommon virus that can occur when you already have hepatitis B. Other viral infections can also cause hepatitis, such as the viruses that cause mononucleosis and chicken pox.
All the hepatic (liver) viruses have one thing in common. That is, once they are spread to you, they infect the liver and then cause inflammation (hepatitis). The viruses are spread in different ways. But all of them can affect your health over a long time. Possible complications include cirrhosis, liver cancer, and liver failure.
Viral hepatitis can be spread through contact with contaminated body fluids. It can also be spread by blood products, transfusions, I.V. drug use, tattoos and piercings with nonsterile instruments, and certain medical procedures. Hepatitis B can be spread through sexual contact. Hepatitis C is rarely spread through sexual contact. Hepatitis A can be acquired by contaminated food or water and contact with stool from an infected person.