I have elevated ast, alt and ggt levels but i don't drink. what are other possible causes?

Liver enzymes: Sometimes this can be due to gallbladder problems/stones. It is common in women 20s-40s, especially if they are overweight. There is also fatty liver disease where your liver fails to process the dietary fats efficiently, common with obesity. Medication can be a cause, especially those metabolized by the liver. Infection and other inflammatory causes are possible. Your doctor can tell you more.