Seeing “high liver enzymes” on routine lab work can be unsettling—especially if you’ve been under pressure and you’re wondering whether stress could be the reason.
Here’s the calm, practical answer: stress may play a role in mildly elevated liver enzymes for some people, but it’s usually not the only thing worth checking. ALT and AST are signals that your clinician interprets in context—alongside symptoms, alcohol intake, medications, recent illness, and metabolic health.<
If your results came from an annual physical, you’re not alone: mild elevations are common, and most cases have an identifiable, manageable cause once you look at the full picture.
Medical disclaimer: This article is for general education and can’t replace medical advice, diagnosis, or treatment from a licensed clinician.
What are liver enzymes (ALT and AST), in plain English?
ALT and AST are enzymes found inside cells.
- ALT is mostly found in the liver.
- AST is found in the liver and in muscles.
When liver cells (or sometimes muscle cells) are irritated or injured, ALT/AST can “leak” into the blood. That’s why you can have elevated ALT/AST even if you feel fine.
What counts as “elevated,” and is it always serious?
“Elevated” depends on your lab’s reference range. A helpful way to think about it:
- Mildly elevated liver enzymes are common and often discovered by accident.
- The trend matters: Are numbers going down, stable, or rising?
- Other labs matter too (like bilirubin and clotting tests). ALT/AST don’t tell the whole story.
If your numbers are extremely high, or you have concerning symptoms (see red flags below), that’s not a “wait and see” situation.
Can stress cause elevated liver enzymes?
Sometimes—especially when elevations are mild.
Stress can affect your body in ways that may nudge liver enzymes upward:
- Stress hormones and inflammation: Chronic stress can influence inflammatory signals and metabolism.
- Sleep disruption: Poor sleep is a common stress effect and can worsen metabolic health over time.
- Behavior changes during stress: Some people drink more alcohol, eat more ultra-processed food, move less, and gain weight when stressed—factors strongly linked with fatty liver and higher ALT.
Just as important: stress is rarely the only explanation. If your enzymes are moderately or severely elevated, or if other liver tests are abnormal, clinicians generally look beyond stress.
What’s more likely than stress: common causes of high liver enzymes
If you’re trying to make sense of “high liver enzymes,” it helps to start with the common causes of elevated liver enzymes—because these explain most routine lab abnormalities.
Fatty liver (MASLD/NAFLD)
Fatty liver disease is closely tied to metabolic health (weight, insulin resistance, triglycerides, and blood pressure). It’s one of the most common reasons for mild ALT elevation.
If you want a plain-language overview, start here:
For a deeper look at warning signs, see Signs of Liver Disease You Shouldn’t Ignore.
Alcohol
Alcohol can raise liver enzymes. If stress has changed your habits, it’s worth being honest about:
- how many days per week you drink
- how many drinks on a typical day
- whether weekend drinking is heavier than weekday drinking
Medications and supplements
Some prescription medications, over-the-counter pain relievers, and supplements can affect the liver.
Practical move: bring a complete list (including vitamins, herbals, and “natural” products) to your appointment. Don’t stop prescribed medications without medical guidance.
Viral hepatitis and other infections
Hepatitis A, B, or C can elevate ALT/AST. Other viral illnesses can do it too.
If you’d like a simple primer:
Muscle injury or very intense exercise
Because AST can come from muscle, a hard workout right before labs, muscle injury, or certain muscle conditions can push AST up (and sometimes ALT too). If you had unusual soreness or heavy exercise before testing, mention it.
What to do next if your ALT/AST are high
If you don’t have red-flag symptoms and your clinician isn’t urgently concerned, a stepwise plan is common.
Confirm the full picture (not just ALT/AST)
Ask your clinician:
- Are other liver tests abnormal too (bilirubin, alkaline phosphatase)?
- Do I have signs of liver function problems (like abnormal clotting tests)?
- Is ALT higher than AST, or vice versa?
Review the “usual suspects” (quick checklist)
Before you decide it’s stress, consider:
- alcohol intake
- medication/supplement changes
- recent illness
- recent intense exercise
- weight changes and blood sugar control
Expect follow-up testing if it persists
A typical evaluation may include additional blood tests and, often, an ultrasound—especially if elevations persist or there are risk factors for fatty liver.
If your clinician thinks it’s mildly elevated, they may recheck labs after a short interval. The exact timing depends on your numbers and your clinical situation.
When to seek urgent care (red flags)
Seek urgent medical evaluation if elevated liver enzymes come with:
- yellowing of the skin or eyes (jaundice)
- confusion, unusual sleepiness, or trouble staying awake
- severe abdominal pain
- persistent vomiting
- very dark urine or pale/clay-colored stools
- easy bruising or bleeding
For additional symptom context, browse BestNutris’s liver-health resources for symptom guides that match your situation.
While you wait: low-risk ways to support liver health
These steps don’t replace evaluation, but they’re generally reasonable while you’re waiting for follow-up:
- Avoid alcohol for now, at least until you understand what’s driving the change.
- Prioritize sleep for 2–3 weeks (stress and sleep are tightly connected).
- Keep meals simple most days: vegetables, fruit, beans, whole grains, lean protein; limit sugary drinks.
- Move daily, even if it’s a 20–30 minute walk.
- Pick one stress tool you’ll actually do: a short walk, a 5-minute breathing exercise, or a brief daily wind-down routine.
If fatty liver is a possibility for you, you may also find this helpful: Can Fatty Liver Be Reversed at Home?
References
- Cleveland Clinic. Transaminitis. https://my.clevelandclinic.org/health/symptoms/transaminitis
- Cleveland Clinic. Elevated Liver Enzymes. https://my.clevelandclinic.org/health/symptoms/17679-elevated-liver-enzymes
- Mayo Clinic. Elevated liver enzymes (definition and causes). https://www.mayoclinic.org/symptoms/elevated-liver-enzymes/basics/definition/sym-20050830
- American Association for the Study of Liver Diseases (AASLD). How to approach elevated liver enzymes? https://www.aasld.org/liver-fellow-network/core-series/back-basics/how-approach-elevated-liver-enzymes
- American Academy of Family Physicians (AAFP). Mildly Elevated Liver Transaminase Levels: Causes and Evaluation (2017). https://www.aafp.org/pubs/afp/issues/2017/1201/p709.html
- U.S. Department of Veterans Affairs. Acute mild to moderate aminotransferase elevation. https://www.hepatitis.va.gov/provider/courses/livertests/livertests-16-01-02.asp
