The Mayo Clinic reports that elevated liver enzymes are associated with damaged or inflamed cells in the liver. The most common elevated enzymes found in blood testing are alanine transaminase and aspartate transaminase. Other factors often contribute to temporarily elevated liver enzymes, and are not associated with severe conditions.
Some common causes of elevated liver enzymes include some prescription medications, alcohol, heart failure, hepatitis A, B and C, nonalcoholic fatty liver disease, obesity, and some over-the-counter medications, such as acetaminophen, according to the Mayo Clinic. Numerous less common, but more serious causes include heart attack, cirrhosis, celiac disease, hypothyroidism, mononucleosis, pancreatitis, muscular dystrophy, toxic and alcoholic hepatitis, and liver cancer.