Maybe you had routine blood work and you expected everything would be normal. But you saw the words “elevated liver enzymes” or “abnormal liver blood test” in your results. That can sound scary, especially if you feel fine.
Mild liver enzyme elevation is common. It means that certain proteins from your liver cells are higher than expected in your blood. This may happen when the liver is irritated, inflamed or injured.
Sometimes these increases are temporary. Other times, they may be an early sign of liver inflammation, fatty liver disease, medication effects, alcohol-related liver problems, viral hepatitis or another condition. “There are a myriad of causes,” said Haripriya Maddur, MD, a hepatologist (liver specialist) with Banner - University Medicine.
An abnormal result is just the first step. Your provider will review your AST and ALT levels, look at your health history and decide whether you need more blood work, imaging or specialty care.
What are liver enzymes?
Liver enzymes are proteins found in liver cells. When your liver cells are irritated or injured, some of these enzymes may enter your bloodstream and show up as high liver enzymes on a blood test.
Your health care provider may uncover abnormal liver blood test results during routine bloodwork, pre-surgery labs or testing for unrelated symptoms.
What do AST and ALT mean?
Elevated AST and ALT are common findings on a routine blood test. Providers look at AST and ALT together, along with other blood tests and symptoms.
AST stands for aspartate aminotransferase. It can come from the liver and from muscles and other tissues. High AST levels could be related to muscle injury, intense exercise or other non-liver causes.
ALT stands for alanine aminotransferase. It is more specific to the liver.
What is considered elevated?
What counts as elevated depends on the lab, the specific test and your health history. Your provider will look at how high the number is, whether it is rising or falling and whether your other liver tests are abnormal.
“Elevated liver enzyme thresholds vary by gender,” Dr. Maddur said. These levels are considered high:
- Men: ALT above 30
- Women: ALT above 19
What causes elevated liver enzymes?
There are many possible causes of elevated liver enzymes. Some are common and treatable. Others are less common but need closer evaluation. Your provider will look at your medical history, medicines, alcohol use, weight, metabolic health, symptoms and lab patterns to help narrow the cause.
MASLD
Fatty liver disease, now called metabolic dysfunction-associated steatotic liver disease (MASLD), is one of the most common causes of high liver enzymes. It happens when extra fat builds up in the liver. MASLD is often linked to insulin resistance, type 2 diabetes, higher body weight, high cholesterol, high triglycerides or high blood pressure.
Alcohol-related liver disease
Drinking alcohol may cause your liver enzymes to rise, especially if you have other liver risk factors. Your risk is higher with heavier or long-term drinking.
Medications and supplements
Some medicines and supplements can affect your liver enzyme levels, including acetaminophen, certain antibiotics, seizure medicines, cholesterol medicines and some supplements. Talk with your provider before you stop, start or change any medication or supplement.
Viral hepatitis
Hepatitis A, B and C can cause liver inflammation and may lead to long-term liver problems.
Less common causes
Less common causes of high liver enzymes include autoimmune liver disease, inherited conditions, bile duct disease, cirrhosis (liver scarring) and, rarely, liver cancer.
“Liver enzyme elevation may sometimes not be related to the liver and may be caused by shock, muscle injury or cardiac dysfunction, among others,” Dr. Maddur said.
Temporary causes of mild liver enzyme elevation
Mild liver enzyme elevation can sometimes be temporary. These factors may cause short-term changes:
- Recent illness
- Intense exercise
- Muscle injury
- Dehydration
- Alcohol use
- Certain medicines
Your provider may repeat testing before ordering more advanced tests to rule out temporary causes.
Can you have elevated liver enzymes with no symptoms?
Yes. Many people have elevated liver enzymes with no symptoms. It’s common to uncover abnormal liver blood test results during routine blood work. That’s why follow-up testing is important, even if you feel well.
Symptoms that may signal liver problems
Many mild elevations do not cause symptoms. These symptoms may appear if liver inflammation or liver damage becomes more serious.
- Yellow skin or eyes (jaundice)
- Dark urine
- Pale stools
- Belly pain
- Swelling
- Fatigue
- Nausea
- Blood in vomit or stools
- Itching
- Easy bruising
- Confusion
“If you have jaundice or confusion, you should seek medical attention immediately,” Dr. Maddur said.
When to see a doctor about high liver enzymes?
The number matters but so does the pattern. Your provider will look at:
- How high your liver enzyme levels are
- How long they have been high
- Whether other test results or symptoms point to liver disease
What happens next after an abnormal liver blood test?
An abnormal liver blood test does not always lead to invasive testing. Many people start with these tests and screenings.
Review of medications, supplements and alcohol use
Your provider may ask you about alcohol, exercise, recent illness, medications and supplements before repeating labs or ordering other tests:
- Bring a list of your prescriptions, over-the-counter (OTC) medicines, vitamins and supplements to your appointment
- Be honest about your alcohol use so your provider can make safe recommendations
Repeat blood tests
Repeat testing can show whether the result was temporary. Your provider may:
- Repeat AST and ALT
- Check bilirubin, alkaline phosphatase, albumin, platelet count and clotting tests
Imaging tests
Imaging helps your provider see the liver and nearby structures:
- A liver ultrasound can check for fatty liver, liver texture, masses, bile duct issues or other changes
- CT or MRI may be used if more detail is needed
Specialized liver testing
Your provider may also suggest:
- Additional blood tests to check for hepatitis, autoimmune disease, iron overload or other causes
- FibroScan to measure liver stiffness and fat in the liver
- A liver biopsy, in some cases
- Referral to gastroenterology or hepatology
How to lower liver enzymes
The best way to lower elevated liver enzymes depends on the cause. You shouldn’t try to treat abnormal labs without understanding why they are high. Here’s what may help:
Build liver-friendly habits
- Maintain a healthy weight or work toward weight loss if needed
- Eat more vegetables, fruits, whole grains, lean proteins and healthy fats
- Limit highly processed foods and sugary drinks
- Exercise regularly, based on your health and ability
- Manage diabetes, cholesterol and blood pressure
- Drink enough water
Limit or avoid alcohol if recommended
Alcohol can make liver inflammation worse, so you should ask your provider what is safe for you. Your provider may recommend that you avoid alcohol completely.
Review your medications and supplements
Some medicines and supplements can affect the liver, including acetaminophen and natural supplements.
Prevent and treat liver infections
- Vaccines can help prevent hepatitis A and hepatitis B
- Ask your provider if you need hepatitis C screening or treatment
- Safer sex and avoiding shared needles can lower your risk of viral hepatitis
When to see a liver specialist
You may need to see a liver specialist if levels:
- Are several times higher than normal
- Do not improve or keep rising
- Happen along with symptoms such as jaundice, dark urine, belly swelling or severe pain
Bottom line
Elevated liver enzymes are common and can happen for many reasons. If your liver enzymes are high or you have symptoms, a Banner Health gastroenterologist can help you find out what’s causing the increase and recommend a treatment plan.
Frequently asked questions about elevated liver enzymes
What level of liver enzymes is dangerous?
There is no single number that is dangerous for everyone. Your provider will look at how high your AST and ALT are, whether they are rising, whether other liver tests are abnormal and if you have symptoms.
Can stress cause elevated liver enzymes?
Stress alone is not usually a direct cause of high liver enzymes. But stress may affect habits that influence liver health, such as alcohol use, sleep, eating patterns, medication use and weight.
Can exercise raise AST levels?
Yes. Intense exercise or muscle injury can sometimes raise AST because AST is also found in muscle. Your provider may ask about recent workouts or injuries and may repeat testing if needed.
How long does it take for liver enzymes to return to normal?
It depends on the cause. Temporary elevations may improve within days or weeks. Liver enzymes related to MASLD (formerly known as fatty liver disease), alcohol use, hepatitis or medication effects may take longer and need a treatment plan.
Are elevated liver enzymes reversible?
Sometimes. Elevated liver enzymes may improve when the cause is treated or managed. For example, changes in alcohol use, weight, diabetes control, medications or treatment for hepatitis may help. More advanced liver disease may need long-term specialty care.
Can you have high liver enzymes and feel fine?
Yes. Many people with elevated liver enzymes have no symptoms. That is why abnormal liver blood test results should be reviewed, even if you feel healthy.
What foods should you avoid with elevated liver enzymes?
There is no single liver diet for everyone. In general, it may help to limit alcohol, sugary drinks and highly processed foods. Your provider may recommend a plan based on the cause of your elevated liver enzymes.
