Quick answer: fatty liver usually causes no symptoms at all in the early stages. When symptoms do appear, they tend to be vague: tiredness, mild discomfort in the upper right belly, or a feeling of fullness. Most cases are found by chance on a blood test or ultrasound.
What fatty liver is
Fatty liver means extra fat has built up in liver cells. The most common form is now called metabolic dysfunction-associated steatotic liver disease (MASLD), previously known as non-alcoholic fatty liver disease (NAFLD). It’s closely linked to insulin resistance, extra weight, type 2 diabetes, high cholesterol and high triglycerides. Alcohol-related fatty liver is a separate cause.
Symptoms that sometimes appear
- Ongoing fatigue
- A dull ache or heaviness in the upper right side of the abdomen, under the ribs
- Feeling full quickly
- Mild unexplained nausea
- Darker, velvety skin on the neck or armpits, which points to insulin resistance rather than the liver itself
- A larger waist than before
None of these is specific. Many other conditions can cause the same feelings, so don’t self-diagnose.
Signs of more advanced liver disease
If fatty liver progresses to inflammation, scarring or cirrhosis, symptoms can include:
- Yellowing of the skin or eyes (jaundice)
- Swelling in the legs or belly
- Easy bruising or bleeding
- Itchy skin
- Dark urine and pale stools
- Confusion or unusual sleepiness
- Small spider-like blood vessels on the skin
These need prompt medical attention.
Who is more likely to have it
Risk is higher if you have:
- Extra weight, especially around the waist
- Type 2 diabetes or prediabetes
- High triglycerides or low HDL cholesterol
- High blood pressure
- Polycystic ovary syndrome
- Obstructive sleep apnea
- A family history of liver disease
People of South Asian background can develop fatty liver at lower body weights, so a normal BMI doesn’t rule it out.
How doctors find it
- Blood tests: liver enzymes (ALT and AST) are often checked, though they can be normal even when fat is present
- Ultrasound: a common, painless first scan that shows fat in the liver
- FIB-4 score: a simple calculation from age, enzymes and platelets that estimates scarring risk
- Elastography (such as FibroScan): measures liver stiffness, which reflects scarring
- Biopsy: rarely needed, used when the diagnosis is unclear
What you can do
Lifestyle change is the main treatment. Losing 5 to 10% of body weight, eating less sugar and refined food, moving most days, and keeping blood sugar and cholesterol under control can all reduce liver fat. See our guide to foods to avoid with fatty liver for a practical food list. Limit or avoid alcohol. Medicines exist for people with advanced inflammation and scarring, and a specialist decides who needs them.
Related conditions deserve attention too. If your triglycerides are high, read about what causes high triglycerides.
When to see a doctor
Book an appointment if you have risk factors, even without symptoms. Ask for liver tests, especially if you have diabetes. Seek urgent care for jaundice, vomiting blood, black stools or sudden belly swelling.
Frequently asked questions
Can you feel fatty liver?
Most people can’t. Some have a vague ache or tiredness, but these are non-specific.
Is fatty liver dangerous?
Simple fat buildup is often mild. In some people it progresses to inflammation (MASH), scarring and, over many years, cirrhosis. Early changes can prevent that.
Can a normal ALT rule out fatty liver?
No. Liver enzymes can be normal while fat is present, which is why imaging may be needed.
Cura Editorial Team
Contributor at Cura Health Journal.