Most people with fatty liver disease have no symptoms at all, which is exactly why the condition goes undetected in so many cases. Roughly 1 in 4 adults has excess fat stored in their liver, and the vast majority learn about it incidentally, through blood work or an imaging scan done for another reason. If you’re wondering whether you might have it, the honest answer is that you probably can’t tell from how you feel alone. But there are risk factors, subtle signs, and simple tests that can point you toward an answer.
Why You Probably Won’t Feel It
Fatty liver disease in its early stages is a silent condition. The liver has no pain receptors inside it, so fat accumulating in liver cells doesn’t produce a sensation you’d notice. When symptoms do eventually show up, the two most common are persistent fatigue and a vague discomfort or fullness in the upper right side of your abdomen, just below the ribs. Some people also describe a general sense of feeling unwell. But these symptoms are nonspecific, meaning dozens of other conditions could explain them just as easily.
This is why relying on symptoms to detect fatty liver is unreliable. The condition is typically caught through other means: a routine blood panel that comes back with elevated liver enzymes, or an ultrasound that reveals a bright, echogenic liver. If you have risk factors, proactive screening is the most dependable path to finding out.
Risk Factors That Raise Your Odds
Fatty liver disease, now formally called metabolic dysfunction-associated steatotic liver disease (MASLD), is tightly linked to metabolic health. You only need one of the following to qualify for the diagnosis alongside liver fat:
- Overweight or central obesity: a BMI of 25 or above, or a waist circumference greater than 37 inches (94 cm) for men or 31.5 inches (80 cm) for women
- Elevated 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 current use of blood pressure medication
- High triglycerides: 150 mg/dL or above, or use of a lipid-lowering drug
- Low HDL cholesterol: below 40 mg/dL for men or below 50 mg/dL for women
If you check even one of those boxes, your likelihood of having some degree of liver fat goes up considerably. If you check three or more, the probability is high enough that screening makes sense even in the absence of symptoms. Waist circumference alone is a surprisingly strong predictor, particularly central belly fat that sits deep around the organs rather than just under the skin.
What Blood Tests Reveal
The first clue often comes from a standard metabolic panel or liver function test. Two enzymes, ALT and AST, are released into the bloodstream when liver cells are damaged or inflamed. Elevated levels don’t confirm fatty liver on their own, but they signal that something is going on and prompt further investigation. In fatty liver without significant alcohol use, ALT is usually higher than AST. When AST runs higher than ALT, that pattern can suggest either alcohol-related liver damage or more advanced scarring.
It’s worth knowing that many people with fatty liver have completely normal liver enzymes. Normal blood work does not rule out the condition. This is one of the reasons imaging has become an important part of the diagnostic picture.
Your doctor may also use a simple scoring tool called FIB-4, which combines your age, AST, ALT, and platelet count to estimate whether significant liver scarring (fibrosis) is present. A score below 1.45 is reassuring, with a 90% chance that advanced fibrosis is not present. A score above 3.25 strongly suggests it is. Scores between those two numbers fall into a gray zone that usually calls for further testing.
How Imaging Confirms It
An abdominal ultrasound is the most common first step. It’s inexpensive, widely available, and painless. A fatty liver appears brighter than normal on ultrasound because fat reflects sound waves differently. The limitation is that ultrasound isn’t great at detecting mild fat accumulation or telling you exactly how much fat is present.
A more precise option is a FibroScan, a specialized device that measures both liver stiffness (an indicator of scarring) and liver fat using something called a CAP score. The CAP score is measured in decibels per meter, and the results break down into grades:
- S1 (mild fat): 238 to 260 dB/m
- S2 (moderate fat): 260 to 290 dB/m
- S3 (severe fat): 290 to 400 dB/m
The test takes about 10 minutes, feels like a light thumping against your right rib cage, and gives results immediately. It has become the go-to screening tool in many liver clinics because it assesses both fat and fibrosis in one sitting.
For the most accurate fat measurement, an MRI-based technique can quantify liver fat as a precise percentage. At a threshold of about 5% fat content, the liver is considered normal. Fat fractions above roughly 16% indicate at least moderate steatosis, and above 22% indicate severe fat accumulation. MRI is highly accurate but more expensive and not always necessary for initial diagnosis.
The Difference Between Fat and Damage
Not all fatty liver is the same, and understanding where you fall on the spectrum matters. The condition progresses through stages, though many people stay at the earliest stage for years or even decades without advancing.
Simple steatosis means fat is present in the liver but there’s minimal inflammation and no significant scarring. This is the most common form, and while it’s not harmless in the long run, it’s the most reversible stage. Losing roughly 5 to 10% of your body weight can reduce liver fat substantially.
Steatohepatitis (sometimes still called NASH) means the fat has triggered inflammation and early cell damage. This is the stage where the liver starts to scar, and it carries real risk of progressing to fibrosis and eventually cirrhosis. The distinction between simple fat and active inflammation generally requires either advanced imaging, specialized blood panels, or in uncertain cases, a liver biopsy.
Fibrosis and cirrhosis represent progressive scarring. Early fibrosis can still be reversed if the underlying cause is addressed. Cirrhosis, where scar tissue has extensively replaced healthy liver tissue, is largely irreversible and brings serious complications. A FibroScan stiffness measurement between 8.0 and 12.0 kilopascals falls in an indeterminate zone that typically warrants referral to a liver specialist for further evaluation, possibly including a biopsy or more advanced MRI.
What a Physical Exam Can and Can’t Tell You
During a physical exam, your doctor may try to feel the edge of your liver by pressing beneath your right rib cage while you take a deep breath. A normal liver span along the midline of the collarbone is 6 to 12 centimeters. If the liver edge extends well below the ribs or feels firm or rounded rather than thin and sharp, that suggests enlargement or abnormal texture. But many people with fatty liver have a normal-feeling liver on exam, especially in early stages.
Interestingly, some of the most telling signs of liver disease show up outside the abdomen entirely. Skin changes associated with insulin resistance, such as darkened, velvety patches on the neck or armpits, can be indirect clues. Your doctor may also look at your palms, eyes, and skin for signs of more advanced liver dysfunction, though these typically appear only in later stages.
A Practical Path to Finding Out
If you have metabolic risk factors and want to know where you stand, the most straightforward approach is to ask your primary care doctor for a liver function panel (AST, ALT, and related markers) along with an abdominal ultrasound. These two tests together catch the majority of clinically significant fatty liver cases. If results are abnormal or you have type 2 diabetes, which carries a particularly high risk, a FibroScan can provide a clearer picture of both fat content and any scarring that may have developed.
Keep in mind that fatty liver is common enough that finding it isn’t a crisis. The critical question is whether inflammation and scarring are present, because that determines whether the condition needs active monitoring or just lifestyle changes. Most people with simple steatosis can improve their liver health through weight loss, regular physical activity, and reducing refined carbohydrates and sugary drinks, often seeing measurable reductions in liver fat within a few months.