Category

Examples

Increased hydrostatic portal hypertension

Cirrhosis (~80%), heart failure, Budd-Chiari syndrome

Hypoalbuminemia

Nephrotic syndrome, protein-losing nephropathy, malnutrition

Peritoneal disease

Tumors (~10%), chlamydial peritonitis, systemic lupus erythematosus, portal vein thrombosis, Meigs syndrome (benign ovarian tumor with ascites and pleural effusion)

Other

Chylous ascites, pancreatitis, myxedema, hemoperitoneum from trauma