What does it mean when alanine aminotransferase (ALT) is 90?

　　An ALT level of 90 refers to 90 U/L. The normal value for alanine aminotransferase (ALT) is less than 40 U/L. A level of 90 U/L—more than twice the upper limit of normal—is considered relatively severe. It is important to visit a hospital to determine the underlying cause. Common causes include drug-induced liver injury, alcoholic hepatitis, and viral hepatitis. Treatment should be tailored according to the specific cause.

　　1. Drug-induced liver injury

　　This condition may occur in patients undergoing anti-tuberculosis treatment for tuberculosis. Additionally, individuals with chronic conditions such as hypertension or diabetes who require long-term medication may also develop abnormal liver function, manifesting as elevated transaminase levels. Some cases result from liver damage caused by physical or chemical factors, leading to impaired liver function. All potentially harmful medications should be discontinued to prevent further injury.

　　2. Alcoholic hepatitis

　　Excessive long-term alcohol consumption or binge drinking can overwhelm the liver's ability to metabolize alcohol, leading to alcoholic hepatitis and impaired liver function. This may present with negative tests for hepatitis A and E but elevated ALT levels. The first step is complete abstinence from alcohol, followed by taking liver-protective medications under medical supervision, such as Hepatoprotective Tablets or Compound Glycyrrhizin Tablets.

　　3. Viral hepatitis

　　Most commonly seen in chronic hepatitis B and hepatitis C, these infections often have prolonged courses with recurrent flare-ups that lead to hepatocyte membrane damage. The main manifestation is impaired amino transferase metabolism, resulting in elevated enzyme levels. Patients may experience symptoms such as liver area pain, fatigue, and general malaise. Antiviral therapy, including medications like Entecavir tablets or Tenofovir tablets, should be administered under a physician’s guidance.

　　In addition, cirrhosis can also cause elevated ALT levels. Early medical evaluation is strongly recommended, and patients should seek timely diagnosis and treatment from qualified physicians to avoid disease progression.