Fatty Liver Symptoms: Why Most People Feel Nothing

TL;DR

• Most people with MASLD (metabolic dysfunction-associated steatotic liver disease, formerly NAFLD) have no symptoms at all. When symptoms do appear, they are vague: tiredness, or a dull ache in the upper right abdomen.
• Clear warning signs such as yellow skin, belly swelling, easy bruising and confusion usually mean the liver is already badly scarred. They are not early signals.
• Because you can’t feel it, the way to find out is testing: blood tests, a FIB-4 score, and sometimes a FibroScan. This matters most if you have diabetes, extra weight around the waist or other metabolic risk factors.

Most people with fatty liver feel nothing. The condition is usually found by accident, on an ultrasound ordered for another reason or on a blood test that shows raised liver enzymes. If symptoms do appear, they are vague and easy to blame on something else: tiredness, or a dull ache or fullness in the upper right side of the belly.

That silence is the main problem with fatty liver, not a reason to relax. The liver can quietly accumulate scarring for years before it causes any sign you could notice. This guide covers what symptoms are possible, what the late warning signs look like, what other things can cause the same complaints, and how to find out where you stand when your body isn’t telling you anything.

Does Fatty Liver Cause Symptoms?

Usually not. The AASLD 2023 practice guidance states that in most patients, fatty liver is asymptomatic or associated with vague symptoms, which often leaves people undiagnosed. People are most commonly referred to a liver clinic because a scan happened to show fat in the liver or because routine blood work showed raised liver chemistries. NIDDK uses the same words: a silent disease with few or no symptoms.

It’s also common, which is part of why so many cases go unnoticed. NIDDK estimates that about 24% of US adults have MASLD, and that about 1.5% to 6.5% have the inflamed form, MASH (metabolic dysfunction-associated steatohepatitis, formerly NASH). Most of these people have never been told.

Two points are worth holding onto:

• No symptoms doesn’t mean no damage. NIDDK notes that you can have no symptoms even if you develop cirrhosis from MASH.
• Symptoms don’t track severity well. Someone with mild fat may feel run down, while someone with significant scarring feels perfectly well. How you feel is a poor guide to how your liver is doing.

What Symptoms Can Fatty Liver Cause?

When symptoms are present, NIDDK lists two: feeling tired, and discomfort in the upper right side of the abdomen. Both are real, and both are nonspecific.

Symptom	What it feels like	Why it’s hard to pin on the liver
Fatigue	Tiredness or low energy that sleep doesn’t fix	Also common with poor sleep, sleep apnea, thyroid problems, low iron, depression and diabetes
Upper right abdominal discomfort	A dull ache or fullness under the right lower ribs	Gallstones, acid reflux, ulcers, constipation and muscle strain can feel the same

Fatty liver often travels with diabetes, high blood pressure and excess weight, so it can be hard to say which condition is behind the fatigue. That’s one reason doctors don’t diagnose fatty liver from symptoms. They diagnose it with tests.

If you have these symptoms, don’t assume fatty liver is the cause, and don’t assume it isn’t. Mention them to your doctor, who can look at the whole picture.

Can You Feel a Fatty Liver?

Usually not. The upper right discomfort NIDDK describes is mild, and most people with fatty liver never notice it. Nobody can feel for themselves whether their liver contains too much fat or scarring, and there is no home check that works.

That’s why a vague ache in that area shouldn’t be dismissed or self-diagnosed. It deserves a proper look, and the answer may turn out to be something unrelated to the liver.

What Are the Warning Signs That Fatty Liver Has Advanced?

The signs most people picture, such as yellow skin, come late. They mean the liver has been scarred enough to stop doing some of its jobs. NIDDK lists these as later symptoms of cirrhosis, as liver function worsens:

• Yellowing of the skin and the whites of the eyes (jaundice)
• Swelling in the belly from fluid buildup (ascites), or swelling in the lower legs, ankles or feet
• Easy bruising and bleeding
• Confusion, trouble thinking, memory loss, personality changes or sleep disorders
• Darker urine and severe itching
• Internal bleeding from swollen veins (varices) in the esophagus, stomach or intestines

NIDDK also lists earlier symptoms of cirrhosis that can be present before these: fatigue or weakness, itching, loss of appetite, unintended weight loss, nausea, mild discomfort in the upper right abdomen, and muscle loss or cramps. Like the early symptoms of fatty liver, they are vague.

If you notice any of these, contact a doctor promptly. Heavy bleeding, such as vomiting blood or passing black stools, or sudden confusion, calls for emergency care. These signs don’t prove you have a liver problem, since other conditions cause them, but they shouldn’t wait for your next routine appointment.

Cirrhosis is also a reason for different food advice than the rest of this site focuses on. Most people with cirrhosis need more protein, not less, and sodium limits can matter. See the cirrhosis diet guide if that’s your situation.

Why Does Fatty Liver Stay Silent for So Long?

Because the damage that matters happens slowly and inside the liver. Fat accumulates first. In some people it triggers inflammation (MASH), and over years inflammation can lead to scarring, called fibrosis. The liver has a large reserve, so it keeps doing its work until a lot of tissue has been scarred. The point where you feel it is usually the point where the disease is advanced.

What this means in practice: the stage of scarring, not how you feel, is what predicts the future. A Swedish study that followed 646 people with biopsy-proven fatty liver for a mean of 20 years found that the risk of severe liver disease (cirrhosis, liver failure or liver cancer) rose with each stage of fibrosis, and that accounting for inflammation (NASH) didn’t change those estimates meaningfully. Our guide to liver fibrosis stages explains what each stage means.

Who Should Be Checked Even Without Symptoms?

The people most likely to have fatty liver with significant scarring are those with metabolic risk factors. The AASLD gives estimates of advanced fibrosis prevalence in higher-risk groups: 6% to 19% in type 2 diabetes and 4% to 33% in people with medically complicated obesity, compared with roughly 0.9% to 2% in the general population.

The 2024 EASL–EASD–EASO guideline advises that health professionals should look for fatty liver with scarring in people who have:

• type 2 diabetes;
• abdominal obesity plus at least one other metabolic risk factor; or
• abnormal liver function tests.

Other risk factors include high blood pressure, high triglycerides or low HDL cholesterol, and a family history of cirrhosis. The AASLD also lists having a first-degree relative with cirrhosis as a higher-risk group. Ask your doctor whether you should be checked, especially if one or more of these apply to you.

How Is Fatty Liver Found If You Have No Symptoms?

Usually in two steps.

Step one: blood tests. ALT and AST are the enzymes most people have heard about, and a raised level can hint at fatty liver. But normal enzymes don’t rule it out, and our guides to ALT and AST levels in fatty liver and liver function test results explain why. Doctors can also use routine results (age, AST, ALT and platelets) to calculate a FIB-4 score, which estimates the chance of advanced scarring. Our FIB-4 calculator does the math.

Step two: a second test if needed. If FIB-4 isn’t clearly low, the next step is usually elastography, such as a FibroScan, which measures liver stiffness as a stand-in for scarring (see FibroScan results explained). Ultrasound, CT and MRI can show fat, but according to NIDDK they can’t detect inflammation or fibrosis by themselves. A liver biopsy is the only test that can confirm MASH and show its severity, but it isn’t recommended for everyone.

What Else Can Cause Liver Symptoms?

Fatty liver is one of several reasons for tiredness or right-sided abdominal discomfort. NIDDK lists other causes of fat in the liver, including alcohol-associated liver disease, rapid weight loss or malnutrition, certain medicines (such as corticosteroids and estrogens), toxin exposure and rare genetic diseases such as Wilson disease. Viral hepatitis and gallbladder disease can also cause similar complaints.

If you drink regularly, say so plainly. Alcohol and metabolic risk factors often overlap, and the right plan differs. Our guide on alcohol and fatty liver covers the details. With significant scarring or cirrhosis, the advice is to avoid alcohol completely.

What Should You Do If You Have No Symptoms but Risk Factors?

1. Know your risk factors. Diabetes or prediabetes, a larger waist, high blood pressure and abnormal blood fats are the main ones.
2. Ask for a liver check. A basic panel with ALT, AST and platelets lets your doctor calculate FIB-4.
3. Write down your numbers. Keep your results so you can compare over time.
4. Start on the habits that help regardless of the result. Fewer sugary drinks and ultra-processed foods, regular activity, and little or no alcohol. Our how to reverse fatty liver guide covers what the guidelines recommend.
5. Don’t wait for symptoms. By the time they appear, the disease is usually advanced.

The Bottom Line

Fatty liver is mostly a silent condition. Most people feel nothing, and the symptoms that do occur (tiredness, a dull ache in the upper right abdomen) are too general to point to the liver. Clear warning signs such as jaundice, belly swelling, easy bruising and confusion come late, with advanced disease. The practical answer is to find out your risk before your body tells you: if you have type 2 diabetes, extra weight around the waist or other metabolic risk factors, ask for a liver check, and keep up the lifestyle changes that protect your liver whatever the results show.

Sources

• AASLD Practice Guidance on the clinical assessment and management of nonalcoholic fatty liver disease (Rinella et al., Hepatology 2023)
• EASL–EASD–EASO Clinical Practice Guidelines on the management of MASLD (Obesity Facts 2024)
• NIDDK: Symptoms & Causes of MASLD and MASH
• NIDDK: Definition & Facts for MASLD and MASH
• NIDDK: Symptoms & Causes of Cirrhosis
• Hagström et al. Fibrosis stage but not NASH predicts mortality and time to development of severe liver disease in biopsy-proven NAFLD (Journal of Hepatology 2017)

This article is for informational purposes only and is not medical advice. Talk to your doctor or hepatologist about your specific situation.