One of the difficulties in diagnosing NASH as the cause of severe scaring or cirrhosis is that as the scaring progresses to cirrhosis, the fat disappears. This results in a condition that is referred to as cryptogenic cirrhosis , cirrhosis in which there is no clear cause. (Specifically, in cryptogenic cirrhosis the two most common causes of cirrhosis - alcohol and viral hepatitis - are not involved.) Cryptogenic cirrhosis has puzzled physicians for many years as to its cause. However, it now appears that half of cryptogenic cirrhosis occurs in patients with obesity and/or diabetes and probably is due to NASH.