Causes

Liver disease has many causes.

Infection

Parasites and viruses can infect the liver, causing inflammation that reduces liver function. The viruses that cause liver damage can be spread through blood or semen, contaminated food or water, or close contact with a person who is infected. The most common types of liver infection are hepatitis viruses, including:

Hepatitis A

Hepatitis B

Hepatitis C

Immune system abnormality

Diseases in which your immune system attacks certain parts of your body (autoimmune) can affect your liver. Examples of autoimmune liver diseases include:

Autoimmune hepatitis

Primary biliary cholangitis

Primary sclerosing cholangitis

Genetics

An abnormal gene inherited from one or both of your parents can cause various substances to build up in your liver, resulting in liver damage. Genetic liver diseases include:

Hemochromatosis

Wilson's disease

Alpha-1 antitrypsin deficiency

Cancer and other growths

Examples include:

Liver cancer

Bile duct cancer

Liver adenoma

Other

Additional, common causes of liver disease include:

Chronic alcohol abuse

Fat accumulation in the liver (nonalcoholic fatty liver disease)

Certain prescription or over-the-counter medications

Certain herbal compounds