Spontaneous hemoperitoneum is uncommon. The etiology of spontaneous hemoperitoneum may be grouped into hepatic, splenic, gynecological, vascular, coagulopathic and cryptogenic. Spontaneous omental hemorrhage without vasculopathy is extremely rare but is often a fatal event. We need to pay attention to patients presenting with a sudden onset of diffuse abdominal pain and signs of peritonitis. If intraperitoneal hemorrhage is suspected, further imaging studies are usually helpful. Early diagnosis, aggressive resuscitation and definitive treatment by the radiologist or surgeon are the only way to save the life of the patient suffering from a spontaneous omental hemorrhage.