General Health · Liver

Fatty Liver on a Scan — What It Means and What to Do

It is the most common incidental finding in abdominal ultrasound, it is frequently reversible, and the scan alone cannot tell you the one thing that matters most.

Fresh salad, olive oil and grilled fish on a table beside water and walking shoes

Fat accumulating in liver cells makes the liver look brighter than normal on ultrasound — often reported as a “bright” or “echogenic” liver, or as hepatic steatosis. It is extremely common, frequently found by accident during a scan booked for something else, and it usually causes no symptoms at all.

Two things are worth holding together. It is not nothing — it is associated with the same metabolic picture as type 2 diabetes and cardiovascular disease, and in a minority it progresses to scarring. And it is one of the more reversible findings in medicine: the liver responds well to sustained changes in weight, diet and alcohol.

Honestly

The limitation that matters most

Ultrasound detects fat reasonably well and grades it broadly as mild, moderate or marked. What it cannot reliably assess is fibrosis — the scarring that actually determines long-term outcome. That distinction is the whole ball game: fat alone in an otherwise healthy liver is a very different situation from fat with established scarring, and a standard scan does not separate them.

Fibrosis assessment uses other tools: blood-test-based scores your GP can calculate, and specialised stiffness measurement such as transient elastography at a liver clinic. We do not offer elastography or blood tests. So if your scan reports fatty liver, the useful next step is your GP — for liver blood tests, a fibrosis risk score, and checks on glucose, cholesterol and blood pressure that go with the same metabolic picture.

Note too that the grading is somewhat subjective and varies between operators and machines, which is another reason a single description should not be over-read.

Causes

Why it happens

Contributor Notes
Excess weight, particularly around the middle The most common association by a distance
Type 2 diabetes and insulin resistance Strongly linked in both directions
Raised cholesterol or triglycerides Part of the same metabolic cluster
Alcohol A separate cause, and it compounds the others
Some medications Discuss with your GP — never stop a prescribed medicine on your own
Rapid weight loss, and some inherited conditions Less common, worth considering when the picture does not fit

You can have fatty liver without being overweight and without drinking, which is why it is worth a proper GP assessment rather than an assumption.

What Helps

What actually improves it

  1. 1
    Gradual weight loss if you carry excess weightLosing around 7–10% of body weight steadily is associated with meaningful improvement in liver fat. Gradual matters — very rapid loss can make things worse.
  2. 2
    Reduce alcoholWhether or not alcohol caused it, cutting down removes an additional load from a liver already under strain.
  3. 3
    Move regularlyPhysical activity improves liver fat even without much weight change — worth knowing if the scales are stubborn.
  4. 4
    Treat what travels with itBlood sugar, cholesterol and blood pressure managed through your GP address both the liver and the cardiovascular risk that usually accompanies it.
  5. 5
    Recheck sensiblyA follow-up scan after sustained changes can show improvement, but it is a slower and blunter measure than your GP’s blood tests. Do not rescan monthly.
FAQs

Your questions answered

Is fatty liver serious?
For most people it is a warning rather than a crisis — a marker of metabolic strain that responds to change. In a minority it progresses to fibrosis and cirrhosis, which is why the fibrosis assessment through your GP matters more than the scan finding itself.
Can it be reversed?
Liver fat frequently reduces with sustained weight loss, reduced alcohol and regular activity. Early scarring can also improve; advanced scarring is much harder to reverse, which is the argument for acting early.
Can the scan tell me if I have scarring?
Not reliably. Standard ultrasound detects fat, not fibrosis. Blood-based scores and elastography assess scarring, and neither is something we offer — your GP arranges them.
I do not drink. How do I have fatty liver?
Alcohol is only one cause. The metabolic form is far more common and relates to weight, insulin resistance and blood lipids — and it occurs in people who are not overweight too. A GP assessment sorts out which picture is yours.
How often should I rescan?
Not often. Ultrasound is a blunt tool for tracking change, and your GP’s blood tests and risk scores are the better measure. A repeat scan after a year of sustained change is reasonable; monthly scanning is not.
Do I need to fast before the scan?
Yes — four hours without food. Water is fine and take your usual medicines.
Related

Where to go from here

ReportsLiver Echotexture Explained

Coarse, heterogeneous, echogenic — what the words mean.

Read the guide →AbdomenStomach Pain After Eating

What the timing suggests, and what a scan can find.

Read the guide →ScansAbdominal Scan

What the scan covers, organ by organ.

See the scan →

The liver looked at properly

Liver size and texture, gallbladder and bile ducts, pancreas, spleen, kidneys and aorta in one 30-minute appointment — explained on screen as we scan, with the report usually within two hours for your GP.

From £159
General abdominal scan

Abdominal scan

5a Lucerne Mews
Kensington, London W8 4ED
3 mins from Notting Hill Gate

This article is general information about fatty liver, not individual medical advice. A fatty liver finding should be followed up with your GP for liver blood tests and a fibrosis risk assessment — see NHS guidance on non-alcoholic fatty liver disease. Standard ultrasound does not assess fibrosis; we do not offer elastography or blood tests.

Written and clinically reviewed by the HCPC-registered sonographers who perform this scan at IUS London — a CQC-registered diagnostic ultrasound clinic (Provider ID 1-2775844974). Your own findings are explained to you at the scan and set out in your report.

Author: Yianni Kiromitis, Senior Sonographer, HCPC RA38415 — over 20 years’ experience in NHS and private ultrasound
Medically reviewed: 9 August 2026