Hepatitis is an inflammation of the liver. It may be caused by a virus. In that case, we call it ‘viral hepatitis’. The most common types of viral hepatitis are hepatitis A, B, C, D and E. The Netherlands has a National Immunisation Programme (NIP) to vaccinate children against hepatitis B. Hepatitis may also be caused by something other than a virus. Toxic substances, medication or autoimmune diseases may also cause it.