Budd-Chiari syndrome is a rare liver condition that occurs when the veins that carry blood from the liver to the heart become blocked or narrowed. Other names for this condition include hepatic vein obstruction, hepatic venous outflow obstruction, and hepatic vein thrombosis. Although the underlying causes of Budd-Chiari syndrome may vary, the symptoms typically include abdominal pain, hepatomegaly (enlarged liver), and ascites. Treatment options include medications that thin the blood and reduce clotting, as well as surgical procedures to remove the blockage or repair the damaged veins. If left untreated, Budd-Chiari syndrome can lead to liver failure and potentially life-threatening complications.