Most people with fatty liver disease have no symptoms at all, which is exactly why it’s so hard to tell on your own. The condition affects your liver silently for years, and the majority of cases are caught incidentally during blood work or imaging done for another reason. Still, there are physical clues, risk factors, and simple tests that can point you in the right direction.
Why Fatty Liver Rarely Causes Symptoms
Your liver doesn’t have many pain-sensing nerves inside it. Fat can quietly accumulate in liver cells for a decade or more without producing any obvious warning signs. When symptoms do eventually appear, they tend to be vague: persistent fatigue, a general feeling of being unwell, or mild discomfort in the upper right side of your abdomen, just below your ribs. These are easy to dismiss or attribute to stress, poor sleep, or aging.
Because of this silence, fatty liver is often called a “silent” disease. The absence of symptoms doesn’t mean the absence of damage. By the time you feel something clearly wrong, the disease may have already progressed from simple fat buildup to inflammation or even scarring.
Risk Factors That Raise Your Odds
If you can’t feel fatty liver, the next best thing is knowing whether you’re at higher risk. The condition is now formally called Metabolic Dysfunction-Associated Steatotic Liver Disease (MASLD), and it’s diagnosed when liver fat is present alongside at least one of these metabolic risk factors:
- Elevated body weight: a BMI of 25 or above (23 in people of Asian descent), or a waist circumference over 37 inches (94 cm) for men or 31.5 inches (80 cm) for women
- High blood sugar: a fasting glucose of 100 mg/dL or higher, an HbA1c of 5.7% or above, or a type 2 diabetes diagnosis
- High blood pressure: readings at or above 130/85 mmHg, or taking blood pressure medication
- High triglycerides: 150 mg/dL or above, or taking lipid-lowering medication
- Low HDL cholesterol: below 40 mg/dL for men or below 50 mg/dL for women
You only need one of these to qualify, and most adults with metabolic issues have several. The overlap with type 2 diabetes is striking: roughly 65% of people with type 2 diabetes also have fatty liver disease. If you have diabetes, prediabetes, or metabolic syndrome, there’s a strong chance your liver is already storing excess fat.
Physical Clues You Can Check at Home
There’s no home test for fatty liver, but your body does offer a few hints. Waist circumference is one of the strongest predictors of liver fat. Grab a flexible tape measure and wrap it around your bare abdomen at the level of your belly button. For men, a measurement above 37 inches signals elevated risk. For women, the threshold is about 31.5 inches. In Chinese and other East Asian populations, slightly lower cutoffs are used (about 35 inches for men, 33.5 inches for women), because visceral fat accumulates at lower weights in these groups.
Carrying weight around your midsection, rather than in your hips or thighs, is a particularly strong signal. Visceral fat, the deep abdominal fat surrounding your organs, is metabolically active and closely linked to fat deposits inside the liver itself.
What Blood Tests Reveal
A standard metabolic panel or liver function test can offer early clues. Two liver enzymes, AST and ALT, tend to rise when the liver is inflamed or damaged. In fatty liver disease, these values are typically elevated but not dramatically so, usually less than four times the upper limit of normal. Your doctor might notice mildly elevated enzymes on routine blood work and flag them before you ever have a symptom.
Normal liver enzymes don’t rule out fatty liver, though. You can have significant fat in your liver with perfectly normal blood work. That’s why enzymes are a clue, not a definitive answer.
A more informative blood-based tool is the FIB-4 score, which combines your age, AST, ALT, and platelet count into a single number that estimates how much scarring (fibrosis) your liver has. A FIB-4 score below 1.45 is reassuring, correctly ruling out advanced fibrosis about 90% of the time. A score above 3.25 strongly suggests significant scarring. Scores in between warrant further testing. You can ask your doctor to calculate this from routine labs, or plug the numbers into a free online FIB-4 calculator yourself.
Imaging Tests That Confirm the Diagnosis
Blood work can hint at fatty liver, but imaging is what actually shows the fat. There are three main options, each with different levels of detail.
Ultrasound
A standard abdominal ultrasound is usually the first imaging test ordered. It’s cheap, widely available, and involves no radiation. A fatty liver appears brighter than normal on ultrasound. The limitation is that it’s not very precise. It can miss mild cases and can’t reliably tell you how much fat is present or whether there’s scarring.
FibroScan
A FibroScan is a specialized ultrasound that measures two things at once: liver stiffness (which reflects scarring) and a CAP score (which reflects fat content). The CAP score ranges from 100 to 400 dB/m. A score below 238 is considered normal. Scores between 238 and 260 suggest mild fat accumulation, affecting roughly 11% to 33% of the liver. Scores of 260 to 290 indicate moderate fat (34% to 66% of the liver), and anything above 290 means more than two-thirds of your liver is affected. The test takes about 10 minutes, feels like a gentle thump against your side, and gives results immediately.
MRI-Based Fat Measurement
The most accurate non-invasive option is a specialized MRI technique called MRI-PDFF, which measures the exact percentage of fat in your liver. A fat fraction of 4.4% or higher indicates fatty liver. Moderate fat starts around 13%, and severe fat buildup is above 17%. In clinical studies, this method correctly identifies fatty liver with about 95% accuracy compared to liver biopsy, making it the gold standard for non-invasive diagnosis. The downside is cost and availability. It’s not always covered by insurance and requires an MRI appointment.
Signs That Fatty Liver Has Progressed
Simple fatty liver (fat without inflammation) is the earliest and most common stage. It can progress to a more serious form involving liver inflammation, then to fibrosis (scarring), and eventually to cirrhosis. Most people with simple fat accumulation never reach cirrhosis, but those who do develop distinct physical signs.
Jaundice, a yellowing of the skin and whites of the eyes, is one of the more recognizable signs of advanced liver disease. Spider nevi are another: these are small, visible blood vessels with a central red dot and thin branches radiating outward, often appearing on the chest, face, or arms. Palmar erythema, a persistent reddening of the palms, is common but frequently overlooked. Other signs include white spots or lines on the fingernails, finger clubbing (where the fingertips become rounded and bulbous), and what’s sometimes called “paper money” skin, a pattern of thin, thread-like blood vessels visible on the upper body.
These skin changes signal that the liver is significantly compromised. They’re not signs of early fatty liver. If you notice any of them, the disease has likely been developing for a long time.
Who Should Get Screened
Because fatty liver is so common and so quiet, screening makes sense for anyone in a higher-risk group. That includes people with type 2 diabetes or prediabetes, anyone with obesity (especially central obesity), people with high triglycerides or low HDL cholesterol, and those with a family history of liver disease. If you fall into any of these categories and haven’t had your liver checked, a simple blood panel and ultrasound can provide a baseline. From there, your doctor can determine whether more detailed testing like a FibroScan or MRI is warranted.