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Biomarkers

My ALT Came Back a Little High. Does That Mean Something Is Wrong With My Liver?

Man in his 40s preparing a colorful salad in a bright kitchen

What Is ALT?

ALT (alanine aminotransferase) is an enzyme found mostly in the liver. It's part of the comprehensive metabolic panel (CMP), a routine blood test that also checks kidney function, electrolytes, and blood sugar.

When liver cells are irritated or damaged, ALT leaks into the bloodstream. So a higher ALT can be a sign that something is affecting your liver—though a mild elevation is very common and often not serious.

Common Causes of a Mildly High ALT

  • Fatty liver disease: Now called MASLD (metabolic dysfunction-associated steatotic liver disease), it's the most common cause and is closely linked to excess weight, insulin resistance, and high triglycerides
  • Alcohol use
  • Medications and supplements: Including acetaminophen, statins, some antibiotics, and certain herbal supplements
  • Intense exercise: Hard workouts, especially weightlifting, can temporarily raise ALT and AST
  • Viral hepatitis: Hepatitis B or C
  • Less common causes: Celiac disease, thyroid disorders, iron overload, or autoimmune conditions

What to Do Next

For a mildly elevated ALT, providers often recommend:

  • Repeating the test in a few weeks, avoiding hard exercise and alcohol for a few days beforehand
  • Reviewing medications and supplements
  • Checking related markers: AST, GGT, bilirubin, a lipid panel, A1c, and sometimes hepatitis screening
  • Imaging: An ultrasound may be used to look for fatty liver

How to Support Liver Health

If fatty liver is the cause, the good news is that it's often reversible:

  • Losing 5–10% of body weight can significantly reduce liver fat
  • Limit alcohol and sugary drinks
  • Exercise regularly
  • Focus on whole foods, fiber, and healthy fats

When It's More Urgent

Seek care promptly if you have yellowing of the skin or eyes, dark urine, severe abdominal pain, or an ALT that's many times higher than normal.

Learn more about lab testing here: Heva Lab Testing

The Bottom Line

A slightly high ALT is common and often related to fatty liver, alcohol, medications, or recent exercise. Repeat testing and a few follow-up labs usually clarify the cause—and lifestyle changes often bring it back to normal.

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