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Liver Disease Symptoms: Early and Late Signs of Liver Damage, and the Blood Tests That Check Your Liver

Liver disease is often silent until the liver is badly damaged. Here are the early and advanced signs, the symptoms that need same-day care, the common causes, and which liver blood test answers which question.

Published

November 4, 2026

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11 min read

Medically reviewed by

Rhonda Collins, FNP-C

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Liver disease often causes no symptoms at all until the liver is badly damaged ^[1][2]. When early symptoms do appear, they are vague: tiredness, weakness, itching, poor appetite, nausea, weight loss without trying, and mild discomfort in the upper right side of the abdomen ^[1]. The clearer signs, such as yellowing of the skin or eyes, dark urine, swelling in the legs or belly, easy bruising and confusion, usually come later, as the liver starts to fail ^[1].

That timing is the reason most liver disease is first found on a blood test rather than from a symptom. This article covers the early and advanced signs, the symptoms that need same-day care, the most common causes, and which liver blood test answers which question.

If you are vomiting blood, passing black or bloody stools, or someone with liver disease has become newly confused, skip the reading and get emergency care. The red flags section below explains why.

Early signs of liver disease

The earliest stage of liver disease usually has no symptoms ^[1]. When symptoms do show up early, none of them points clearly at the liver. The U.S. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) lists these as possible early symptoms of cirrhosis, the scarred stage of chronic liver disease ^[1]:

• feeling tired or weak
• itchy skin
• poor appetite and weight loss without trying
• nausea and vomiting
• mild pain or discomfort over the liver, in the upper right side of the abdomen
• muscle loss, weakness and cramps
• sexual problems

Each of these has many causes outside the liver. Fatigue alone overlaps with iron deficiency, thyroid problems, poor sleep and much else, which our guide to blood tests for constant tiredness works through.

The silence is also why liver disease is undercounted. Researchers estimate that about 1 in 400 U.S. adults has cirrhosis, and NIDDK notes the real number is probably higher because many people with early cirrhosis have not been diagnosed ^[2].

Advanced signs of liver damage

As liver function worsens, symptoms become more specific, because they reflect jobs the liver is no longer keeping up with ^[1]. The table pairs each sign with what is going on and the blood test that tends to reflect it.

Dark urine has causes beyond the liver, from dehydration to foods and medicines. Our articles on dark urine and bilirubin in urine cover how to tell them apart.

Liver disease symptoms that need urgent care

Some symptoms should not wait for a routine blood test.

• Vomiting blood, or black or bloody stools. In cirrhosis, enlarged veins in the esophagus or stomach (varices) can burst and bleed. NIDDK advises that anyone who vomits blood or has black or bloody stools go to a hospital right away ^[5].
• New confusion, drowsiness or a personality change in someone with liver disease. This can be hepatic encephalopathy, which needs treatment ^[5].
• New yellowing of the skin or eyes. Jaundice can come from liver disease, a blocked bile duct or red blood cells breaking down too fast ^[3]. Telling those apart needs a medical assessment soon, not a wait-and-see approach.

Not every case of jaundice is serious. Gilbert’s syndrome, a common inherited condition, causes mild, harmless rises in bilirubin, and our Gilbert’s syndrome article explains how it is told apart from liver disease. But that distinction is made with tests, not by waiting.

Common causes of liver disease

Three causes top the list. NIDDK names the most common causes of cirrhosis as alcohol-associated liver disease, a buildup of fat in the liver linked with metabolic conditions such as type 2 diabetes and obesity, and long-term infection with hepatitis B or hepatitis C ^[1]. Some people have more than one cause, and inherited genes appear to affect how much damage each one does ^[1].

Viral hepatitis is a good example of how quiet these causes can be. Most people with hepatitis C have no symptoms. Chronic hepatitis C often causes none until it leads to complications, which can be decades after infection ^[6].

Less common causes include ^[1]:

• Autoimmune hepatitis, in which the immune system attacks the liver.
• Bile duct diseases, such as primary biliary cholangitis and primary sclerosing cholangitis.
• Inherited conditions, including Wilson disease, hemochromatosis and alpha-1 antitrypsin deficiency.
• Long-term use of certain medicines, and high daily doses of vitamin A.
• Chronic heart failure, which slows blood flow out of the liver.

Medicines and supplements deserve their own mention. The American College of Gastroenterology names antimicrobials and herbal and dietary supplements among the most common causes of drug-induced liver injury in Western countries ^[7]. In the U.S. Drug-Induced Liver Injury Network, the share of liver injury cases attributed to herbal and dietary supplements rose from 7% to 20% between 2004 and 2013 ^[8]. Our article on liver damage from supplements covers which products have been implicated.

Fatty liver: the most common cause, and the quietest

Fatty liver disease is one of the most common causes of liver disease ^[1], and it is usually silent. It can also hide on a blood test: in one biopsy study, people with fatty liver disease and a normal ALT showed the same range of liver damage, including advanced scarring, as people with a raised ALT ^[9]. Our fatty liver symptoms and blood tests article covers the condition in depth, including its newer name (MASLD), how to read a FIB-4 score, and what changes it.

Which blood tests check the liver, and what each one answers

No single liver blood test gives a full answer. Some show whether liver cells are being damaged, others show how well the liver is working, and together they usually still cannot name the specific disease ^[4]. What they do well is show a pattern, which points to the next test.

The useful way to read a liver panel is to know which question each marker answers, and where each one can mislead.

Three patterns are worth knowing:

1. Injury pattern. When AST and ALT are raised out of proportion to ALP, the American College of Gastroenterology calls it hepatocellular injury, meaning damage to liver cells themselves ^[10]. The guideline’s workup for this pattern looks for viral hepatitis, fatty liver, alcohol, medicines, and rarer inherited and autoimmune causes ^[10]. Our comparison of ALT and AST covers what the ratio between them adds.
2. Bile-flow pattern. When ALP is raised out of proportion to AST and ALT, it is called cholestatic injury ^[10]. A high GGT alongside it suggests the ALP is coming from the liver ^[13].
3. Function pattern. Low albumin, a high bilirubin or a slow clotting time suggest the liver is struggling to do its work, rather than only being irritated ^[4].

A “normal” result is not always reassuring. The same guideline proposes a truly healthy ALT of about 29 to 33 IU/L for men and 19 to 25 IU/L for women, and suggests assessing levels above that ^[10]. Many lab reference ranges run higher, so an ALT inside your lab’s range can still sit above that healthy level. If your ALT or AST is high, our guides to symptoms of high ALT and lowering liver enzymes are the natural next reads, and our breakdown of ALT, AST, ALP and GGT goes deeper on each enzyme.

Where FIB-4 fits

FIB-4 is a score calculated from your age, AST, ALT and platelet count. It was first developed to estimate liver scarring in people with hepatitis C and HIV ^[15], and the American Association for the Study of Liver Diseases (AASLD) now recommends it as the first step for assessing scarring risk in people with or at risk of fatty liver disease ^[16]. Its inputs come from two ordinary tests: a liver panel and a complete blood count with platelets. How to read the result, including the age caveats, is covered on our FIB-4 page and in the fatty liver article.

What a hepatic function panel covers, and what it leaves out

Mito’s hepatic function panel measures ALT, AST, alkaline phosphatase, total and direct bilirubin, total protein and albumin. That covers the injury, bile-flow and protein questions in the table above.

It does not include GGT or a platelet count. If a raised ALP needs explaining, GGT is the usual add-on. If you want a FIB-4 score, add a complete blood count with platelets. What each of these costs, and how a hepatic function panel compares with a comprehensive metabolic panel, is in our liver function test cost guide.

Where to start

If you have no red-flag symptoms but have a reason to check, start with a hepatic function panel. MedlinePlus lists the usual reasons to test without symptoms: a family history of liver disease, heavy drinking, obesity, diabetes, past exposure to hepatitis, or taking medicines that can affect the liver ^[4]. Add a CBC with platelets if you want a FIB-4 score from the same draw.

If you already have symptoms such as yellowing skin, dark urine with pale stools, or swelling in your legs or belly, see your doctor rather than ordering a test and waiting for the result.

References

1. National Institute of Diabetes and Digestive and Kidney Diseases. Symptoms & Causes of Cirrhosis. Last reviewed June 2023.
2. National Institute of Diabetes and Digestive and Kidney Diseases. Definition & Facts for Cirrhosis.
3. MedlinePlus. Bilirubin Blood Test. National Library of Medicine.
4. MedlinePlus. Liver Function Tests. National Library of Medicine.
5. National Institute of Diabetes and Digestive and Kidney Diseases. Treatment for Cirrhosis.
6. MedlinePlus. Hepatitis C. National Library of Medicine.
7. Chalasani NP, Hayashi PH, Bonkovsky HL, et al. ACG Clinical Guideline: the diagnosis and management of idiosyncratic drug-induced liver injury. Am J Gastroenterol. 2014;109(7):950-966.
8. Navarro VJ, Barnhart H, Bonkovsky HL, et al. Liver injury from herbals and dietary supplements in the U.S. Drug-Induced Liver Injury Network. Hepatology. 2014;60(4):1399-1408.
9. Mofrad P, Contos MJ, Haque M, et al. Clinical and histologic spectrum of nonalcoholic fatty liver disease associated with normal ALT values. Hepatology. 2003;37(6):1286-1292.
10. Kwo PY, Cohen SM, Lim JK. ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries. Am J Gastroenterol. 2017;112(1):18-35.
11. MedlinePlus. AST Test. National Library of Medicine.
12. MedlinePlus. Alkaline Phosphatase. National Library of Medicine.
13. MedlinePlus. Gamma-glutamyl Transferase (GGT) Test. National Library of Medicine.
14. MedlinePlus. Albumin Blood Test. National Library of Medicine.
15. Sterling RK, Lissen E, Clumeck N, et al. Development of a simple noninvasive index to predict significant fibrosis in patients with HIV/HCV coinfection. Hepatology. 2006;43(6):1317-1325.
16. Rinella ME, Neuschwander-Tetri BA, Siddiqui MS, et al. AASLD Practice Guidance on the clinical assessment and management of nonalcoholic fatty liver disease. Hepatology. 2023;77(5):1797-1835.

Frequently asked questions

What are the first signs of liver damage from alcohol?

Often there are none. Alcohol is one of the most common causes of cirrhosis, and like other causes it can stay silent until the liver is badly damaged. When early symptoms do appear they are the same vague ones as other liver disease: tiredness, weakness, poor appetite, nausea and mild discomfort under the right ribs. GGT, a liver enzyme, tends to rise with drinking, which is why it is sometimes used to monitor alcohol use.

Where is liver pain felt?

When the liver causes discomfort, it is usually a mild ache or pain over the liver, in the upper right side of the abdomen just under the ribs. Many people with liver disease never have pain at all, so its absence does not mean the liver is healthy.

Can liver disease cause confusion or memory problems?

Yes. When a damaged liver can no longer clear toxins from the blood, they can build up in the brain. This is called hepatic encephalopathy, and it can cause confusion, difficulty thinking, memory loss, personality changes and sleep problems. In someone with known liver disease, new confusion needs prompt medical care.

Can a blood test tell which liver disease I have?

Not on its own. A liver panel shows whether liver cells are injured, whether bile flow looks blocked and how well the liver is making protein, but it usually cannot name the specific disease. If results are abnormal, the next step is targeted testing, such as hepatitis B and C tests, iron studies, autoimmune markers or an ultrasound, chosen from the pattern of results.