High GGT levels are seen in liver diseases such as hepatitis, cirrhosis, liver tumors, and
jaundice. Other cause of high GGT include heavy or
chronic alcohol use, myocardial infarction, pancreatic cancer or pancreatitis, use of hepatotoxic drugs, and viral infections such as Reye's Syndrome, Epstein-Barr, or cytomegalovirus (CMV). In your case it could be a liver problem.
Do discuss this with your doctor and get yourself examined. Hope this helps.