High GGT levels are seen in liver diseases such as hepatitis, cirrhosis, liver tumors, and jaundice
. Other causes of high GGT include heavy or chronic alcohol use (ruled out in your case), myocardial infarction, pancreatic cancer or pancreatitis and viral infections such as Reye's Syndrome, Epstein-Barr, or cytomegalovirus (CMV). A high bilirubin can indicate hepatitis, liver and pancreatic cancer, cirrhosis, gall stones, and biliary stricture. It can even be due to hemolytic anemia.