High GGT refers to high gamma-glutamyltransferase, and elevated gamma-glutamyltransferase is usually caused by abnormalities in the liver, such as fatty liver, alcoholic liver, drug-induced hepatitis, as well as autoimmune hepatitis and liver tumors. High gamma-glutamyltransferase is usually caused by abnormalities in the liver, and the main clinical causes are fatty liver, alcoholic liver, drug hepatitis, autoimmune hepatitis and liver tumors. In general, if a routine physical examination reveals elevated gamma-glutamyltransferase, further tests are needed to determine the cause. For example, the cause of the disease can be clarified through a variety of tests such as blood tests and liver ultrasound for antibody detection. For example, the presence of tumors, fatty liver and other diseases in the liver can be initially ruled out by liver ultrasound, while hepatitis antibody testing can rule out the presence of autoimmune hepatitis. If the physical examination shows elevated gamma-glutamyl transferase, it may also be biliary obstruction, such as cholelithiasis and other diseases, and it is recommended that the patient go to the hospital as soon as possible to improve the relevant examination and identify the cause of the disease before treatment.