Hepatomegaly

Last updated: January 28, 2026

Summary

Hepatomegaly is an abnormal enlargement of the liver (e.g., liver span > 16 cm in the midclavicular line on ultrasound). Causes are broad and include metabolic (e.g., metabolic dysfunction-associated steatotic liver disease, alcohol-associated liver disease), infectious (e.g., viral hepatitis), congestive (e.g., right-sided heart failure), neoplastic, and infiltrative conditions. Patients may be asymptomatic or present with features of the underlying disorder (e.g., right upper quadrant discomfort, jaundice, or signs of volume overload). Initial evaluation includes history and physical examination, liver chemistries and liver synthetic function tests, and RUQ ultrasound to assess liver size and parenchymal appearance. Further testing (e.g., viral serologies, iron studies, advanced imaging) is guided by risk factors and initial results, while biopsy is reserved for unclear or high-risk cases. Management focuses on treating the underlying etiology.

Etiology

Metabolic ^[1]^[2]
Congestive ^[1]^[2]
Neoplastic ^[1]^[2]
Hematologic ^[1]^[2]^[3]
- Malignancies (e.g., leukemia, lymphoma, myeloproliferative neoplasms)
- Hemoglobinopathies (e.g., sickle cell disease, thalassemia)
Infectious ^[1]^[2]^[4]
- Viral
  - Acute viral hepatitis: A, B, C, E
  - Other viral infections: Epstein-Barr virus, cytomegalovirus, HIV
- Parasitic (e.g., extraintestinal amebiasis, cystic echinococcosis, fasciola hepatica, schistosomiasis)
- Bacterial (e.g., pyogenic liver abscess, syphilis, leptospirosis)
- Mycobacterial (e.g., tuberculosis)
Inflammatory ^[1]
Infiltrative ^[1]^[2]^[3]
- Amyloidosis
- Granulomatous diseases (e.g., sarcoidosis)
- Lysosomal storage diseases (e.g., Gaucher disease)
Congenital ^[1]
- Polycystic liver disease
- Caroli disease

Clinical evaluation

Focused history ^[4]^[5]

Right upper quadrant (RUQ) pain
Constitutional symptoms
Risk factors for CLD (e.g., long-term unhealthy alcohol use, cardiometabolic risk factors for MASLD)
Systemic diseases associated with liver disease (e.g., inflammatory bowel disease, hematologic disease)
Family history of liver disease (e.g., hemochromatosis, Wilson disease)

Focused examination ^[4]^[5]

Signs of chronic liver disease
Pathognomonic signs of a specific chronic liver disease (e.g., Kayser-Fleischer rings in Wilson disease, bronzing of skin in hemochromatosis)
Lymph node examination
Abdominal examination
- Liver percussion: to determine upper and lower margins
- Liver edge palpation: to assess consistency (e.g., firm or soft) and contour (e.g., smooth or irregular)
- Associated findings: splenic enlargement, ascites
Cardiac examination for features of right heart failure

Red flags

RUQ pain: typical of acute hepatomegaly due to stretching of liver capsule (e.g., acute hepatitis)
Associated lymphadenopathy and splenomegaly: suggests hematologic malignancy
Weight loss
Fever

Diagnosis

General principles ^[4]^[6]

Confirm clinical suspicion of hepatomegaly with ultrasound examination of the liver.
Order baseline liver chemistries and liver synthetic function tests.
Further testing is guided by ultrasound findings and the pattern and severity of liver enzyme abnormalities.
Liver biopsy may be indicated if routine investigations are inconclusive.

Initial studies

Liver imaging to confirm hepatomegaly, e.g.: ^[6]
- Ultrasound (first-line)
- CT and/or MRI
Baseline laboratory studies ^[4]^[5]
- Liver chemistries
- Liver synthetic function tests

Additional studies ^[4]^[5]

Laboratory studies

Consider the following studies to investigate the suspected etiology:

Viral hepatitis panel
Lipid panel and hyperglycemia tests to identify cardiometabolic risk factors for MASLD
Serology for type 1 autoimmune hepatitis
See also:

Imaging

The choice of additional imaging is based on liver ultrasound findings, e.g.:

Doppler ultrasound for suspected outflow obstruction (e.g., Budd-Chiari syndrome)
Transthoracic echocardiogram for suspected right heart failure
Multiphase CT/MRI to evaluate focal lesions suggestive of HCC

Common causes

Common causes of hepatomegaly
Condition	Characteristic clinical features	Diagnostic findings	Management
MASLD ^[7]	Often asymptomatic Risk factors for MASLD Absence of other known causes of steatotic liver disease (e.g., heavy alcohol use)	AST and/or ALT: normal or ↑ AST/ALT ratio: usually < 1 Ultrasound: ↑ liver echogenicity	Treatment of obesity and management of metabolic syndrome See “Management of MASLD.”
Alcohol-associated hepatitis ^[8]	Long-term heavy alcohol use Acute-onset jaundice, tender RUQ, constitutional symptoms	Liver enzymes AST: > 50 IU/L Both AST and ALT: < 400 IU/L AST:ALT ratio: > 1.5 Bilirubin: > 3 mg/dL Ultrasound: ↑ liver echogenicity	Immediate alcohol cessation Assess for alcohol withdrawal syndrome. Provide nutritional support. Consider glucocorticoid therapy for severe disease. See "Treatment of alcohol-associated hepatitis."
Acute viral hepatitis ^[9]	Fever, malaise, vomiting Individual risk factors Risk factors for HBV infection Risk factors for HCV infection Risk factors for HAV infection	Liver enzymes: ALT > AST ALT:LDH ratio > 1.5 Acute viral hepatitis panel: positive	See “Treatment of hepatitis B infection.” See “Treatment of hepatitis C infection.” See “Treatment of hepatitis A infection.”
Right-sided heart failure ^[10]	Clinical features of right heart failure	AST > ALT initially ↑ Serum bilirubin ↑ BNP Ultrasound abdomen: dilated inferior vena cava and hepatic veins	Treat the underlying cause. See “Treatment of heart failure.”
Budd–Chiari syndrome ^[11]	Signs of portal hypertension Acute RUQ tenderness	Hepatic vein occlusion on Doppler ultrasound or CT abdomen Ascites fluid analysis: ↑ SAAG Thrombophilia workup: may show an underlying hypercoagulability	Treat the underlying cause. Anticoagulation Thrombolysis or stenting to restore blood flow
Hemochromatosis ^[12]	Fatigue, lethargy Symmetrical arthropathy of 2nd–3rd metacarpophalangeal joints Skin hyperpigmentation Hypogonadism Diabetes mellitus Signs of chronic liver disease	↑ Serum ferritin ↑ Transferrin saturation ≥ 45% MRI liver: hepatic iron accumulation Genetic testing: HFE gene mutation	Therapeutic phlebotomy See “Treatment of hemochromatosis.”
Wilson disease ^[13]	Signs of chronic liver disease Neuropsychiatric features Kayser-Fleischer rings	↓ Ceruloplasmin ↑ 24–hour urinary copper excretion Genetic testing: ATP7B mutation Liver biopsy: ↑ hepatic copper concentration	Chelating agents See “Treatment of Wilson disease.”
Hepatocellular carcinoma ^[14]	Patients typically have cirrhosis. Signs of chronic liver disease Constitutional symptoms RUQ tenderness	Ultrasound: ≥ 1 solid nodules of varying homogeneity and echogenicity, typically ≥ 10 mm ↑ AFP Multiphase CT: hypodense or isodense lesions with arterial phase hyperenhancement and portal venous phase washout	Multidisciplinary team approach Stage-based therapy (see “Treatment of HCC”).

Mimics

Anatomical variants (e.g., Riedel lobe) ^[15]
Apparent hepatomegaly due to downward displacement of the liver (e.g., due to COPD or a right pleural effusion)

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