It is not uncommon for people to have slightly elevated levels of aminotransferase. The most common cause of this is fatty liver disease, which affects between 25 and 51% of people with high liver enzyme levels. Other causes may include medications, alcohol, non-alcoholic fatty liver disease, viral hepatitis, autoimmune disease, congestive heart failure, ischemic hepatitis, and Budd-Chiari syndrome. In some cases, the cause of increased liver enzymes may be temporary and resolve without treatment.
This could be due to hormonal changes or certain medications. However, other causes are more serious and may include conditions such as cirrhosis, hepatitis C, and liver cancer.