We present a rare case of a 25-year-old woman who developed idiopathic portal hypertension and ascites four days after delivering a stillborn child at term. She had no previous liver illness or risk factors for portal vein thrombosis. Investigations revealed a dilated portal vein, esophageal varices, and high serum-albumin gradient ascites, all of which point to a presinusoidal etiology of portal hypertension. There was no indication of cirrhosis, hepatic or portal vein thrombosis, metabolic or autoimmune liver diseases, or persistent infections. She was treated with antibiotics, diuretics, and beta-blockers, and she underwent a therapeutic paracentesis. The etiology of her portal hypertension remains undetermined. Idiopathic portal hypertension is a rare condition of unknown etiology, characterized by portal hypertension without cirrhosis or thrombosis. It is linked to several risk factors and histological abnormalities, and it can be accompanied by portal hypertension consequences, such as variceal hemorrhage and ascites. The diagnosis is made using clinical criteria and the elimination of alternative causes of portal hypertension. Management is mostly symptomatic, intending to avoid and treat portal hypertension consequences. The prognosis varies according to the underlying etiology and presence of complications.