Hepatitis is inflammation of the liver that can vary in severity, from mild to extremely severe, and be acute or chronic, also depending on the underlying cause (viruses, alcohol and other toxic agents, autoimmune reactions, other diseases, etc.).
There are also rare forms of so-called “fulminant” hepatitis because the rapidity of onset and severity of hepatic and general impairment are such that they result in life-threatening clinical pictures within a few days or weeks.