The cause of elevated alanine aminotransferase is liver damage, and there are many factors that can cause liver damage, commonly including viruses, alcohol consumption, and medications. The most common disease that causes elevated alanine aminotransferase is liver injury. Since alanine aminotransferase is mainly found in liver cells, elevated alanine aminotransferase occurs due to the release of aminotransferase after damage to the liver cells due to various reasons. The most common factor is viruses, such as hepatitis viruses, which can cause liver cell damage, which in turn leads to increased transaminases. Other factors, such as alcohol consumption, medications, and excessive accumulation of fat in the liver, can damage the liver and increase transaminases. Further tests are needed to clarify the cause of high aminotransferase.