Symptoms of Fatty Liver Disease

Fatty liver disease is one of the most common liver conditions, and one of the most quietly misleading — most people who have it feel completely fine. This guide focuses specifically on symptoms: what, if anything, you might notice, how that changes as the disease progresses, and when a symptom is a reason to get checked.

Why Fatty Liver Is Often Silent

The liver has substantial reserve capacity, and extra fat can build up inside liver cells for years without causing pain, inflammation, or any noticeable change in how you feel. According to the NIDDK, fatty liver disease "is a silent disease with few or no symptoms." Symptoms, when they do appear, don't reliably track how much fat is present — a liver can be quite fatty and still cause nothing you'd notice, which is part of why this condition is usually found by testing, not by symptoms.

Early Symptoms (and Why Many People Have None)

Most people with early-stage fatty liver — simple fat buildup without significant inflammation or scarring — have no symptoms at all. When early symptoms do occur, the NIDDK describes them as feeling tired, or having discomfort in the upper right side of the abdomen, where the liver sits. Neither of these is specific to the liver — both are common, nonspecific complaints with many possible causes — so their presence doesn't confirm fatty liver, and their absence doesn't rule it out.

Possible Symptoms as the Disease Progresses

As fat buildup is joined by inflammation (a stage sometimes called steatohepatitis) and, over years, scarring, symptoms can become somewhat more noticeable, though still not reliable or specific:

• Persistent fatigue
• Mild, dull discomfort in the upper right abdomen
• Unexplained weight loss
• Poor appetite
• Itchy skin

None of these symptoms, alone or together, diagnoses fatty liver disease or tells you how advanced it is — they're a reason to get evaluated, not a basis for self-diagnosis.

Right-Upper-Abdominal Discomfort

When discomfort does occur, it's typically a dull, aching sensation under the right rib cage, where the liver sits, rather than sharp or severe pain. It doesn't follow a predictable pattern and isn't necessarily related to eating. This kind of mild discomfort can come from liver swelling as fat accumulates, but it has many other possible causes entirely unrelated to the liver, so it isn't, by itself, something that identifies fatty liver disease specifically.

Fatigue and Other Nonspecific Symptoms

Fatigue is one of the most commonly reported symptoms in fatty liver disease, but it's also one of the least specific symptoms in all of medicine — caused by everything from poor sleep to thyroid problems to depression to dozens of other conditions. The same is true of poor appetite or mild, unexplained weight loss. These symptoms are worth mentioning to a doctor, especially alongside risk factors like obesity, type 2 diabetes, or high cholesterol, but none of them points specifically to the liver on its own.

Warning Signs of Advanced Liver Disease

If fatty liver disease progresses over years to significant scarring (fibrosis or cirrhosis), a different, more specific set of symptoms can appear. According to the NIDDK and MedlinePlus, these include:

• Jaundice — a yellowish tint to the skin and the whites of the eyes, from a buildup of bilirubin the liver can no longer process normally
• Abdominal or leg swelling — fluid buildup in the abdomen (ascites) or swelling in the lower legs, ankles, or feet (edema)
• Easy bruising or bleeding — including nosebleeds, because a damaged liver makes fewer of the proteins the body needs to clot blood
• Confusion — difficulty thinking, memory problems, personality changes, or sleep disturbances, from a buildup of toxins the liver normally clears (hepatic encephalopathy)
• Severe itching and darkening of the urine color

These are genuinely different from the early, nonspecific symptoms above — they reflect the liver struggling to perform its basic functions, not just carrying extra fat.

Fatty Liver vs. MASLD vs. MASH: What the Terms Mean

The terminology here changed in 2023, and the older and newer names are both still used:

• Fatty liver disease / MASLD (metabolic dysfunction-associated steatotic liver disease) — the current term for what was called non-alcoholic fatty liver disease (NAFLD). This is fat buildup in the liver linked to obesity, type 2 diabetes, or insulin resistance, without significant alcohol use.
• MASH (metabolic dysfunction-associated steatohepatitis) — the current term for what was called NASH (non-alcoholic steatohepatitis). This is fatty liver disease that has progressed to include liver inflammation, a more active stage than simple fat buildup.
• Fibrosis and cirrhosis — scarring that can develop if MASH continues over years. Fibrosis is scarring at an earlier, often reversible stage; cirrhosis is extensive, largely permanent scarring that significantly impairs how the liver functions.

Fatty liver (simple steatosis), MASH, and cirrhosis are stages on a spectrum, not interchangeable labels — and importantly, symptoms don't reliably track which stage someone is in. The NIDDK specifically notes that a person "may not have symptoms even if you develop cirrhosis due to" MASH/NASH — so the absence of symptoms at any point is reassuring about how you feel, but it isn't proof that no scarring has developed. Our fatty liver disease guide covers these types, causes, and risk factors in full.

How Fatty Liver Is Usually Found Despite Few or No Symptoms

Because fatty liver disease is so often silent, it's usually discovered incidentally — found during blood tests or imaging done for an unrelated reason, or during screening prompted by risk factors like obesity, type 2 diabetes, or high cholesterol — rather than because of symptoms that led someone to seek care. This is normal and doesn't mean something was missed; it reflects how this particular disease actually behaves.

The Role of Liver Blood Tests and Imaging

Two main tools are used to look for fatty liver disease, often together:

• Liver blood tests, also called liver function tests — these measure liver enzymes and other substances in the blood. Our liver function tests guide and liver function test page cover what's measured and what results can mean. Importantly, these tests can be normal even when a meaningful amount of fat is present in the liver, so a normal result doesn't fully rule out fatty liver disease.
• Imaging, usually starting with an ultrasound, can directly show fat in the liver. More specialized imaging (such as elastography) or, less commonly, a liver biopsy can assess how much scarring, if any, has developed — information blood tests and basic imaging can't fully provide on their own.

Neither symptoms nor a single normal test fully excludes fatty liver disease on its own, which is why doctors generally combine your risk factors, blood tests, and imaging rather than relying on any one piece alone.

When to See a Doctor vs. When It's Urgent

See a doctor, without needing to wait for an emergency, if you have risk factors for fatty liver disease (such as obesity, type 2 diabetes, prediabetes, or high cholesterol) and haven't discussed liver screening, or if you notice persistent, unexplained fatigue, poor appetite, weight loss, or right-upper-abdominal discomfort.

Treat the following as reasons to seek medical care promptly, as they suggest the liver may be significantly affected:

• Yellowing of the skin or eyes (jaundice)
• New or worsening swelling of the abdomen or legs
• Easy bruising, unexplained bleeding, or nosebleeds
• Confusion, memory problems, or personality changes
• Vomiting blood or passing black, tarry stools — which can signal bleeding from enlarged veins (varices), a recognized complication of advanced liver scarring

Sources

• NAFLD & NASH: Symptoms & Causes — NIDDK
• Cirrhosis: Symptoms & Causes — NIDDK
• Cirrhosis — MedlinePlus
• New MASLD Nomenclature — AASLD