Ascites in systemic lupus erythematosus (SLE) is rarely massive, and either accompanies the typical manifestations of active disease or results from nephrotic syndrome, protein-losing enteropathy, constrictive pericarditis, and conditions unrelated to lupus. Marked ascites has been attributed to chronic lupus peritonitis, characterized by the insidious onset of massive, painless ascites and unrelated to disease activity. Regardless of the etiology, ascites typically has a gradual onset and occurs after a diagnosis of SLE has been made. We describe a young woman presenting with the rapid development of massive ascites as the initial manifestation of SLE.