Background: Angioedema is a condition that can cause cutaneous and mucosal edema of practically any part of the body. Isolated edema of the intestines is a rather rare manifestation, but it can cause important morbidity. Hereditary angioedema as well as certain medications can give rise to intestinal angioedema. We have seen a rise in frequency of intestinal angioedema since the advent of angiotensin-converting enzyme inhibitors. Ultrasound of the abdomen is an inexpensive, safe, and easy tool that can help in the differential diagnosis. Case Report: We describe the case of a 25-year-old woman who presented with acute abdominal pain. She was diagnosed with intestinal angioedema due to hereditary angioedema type I. Why Should an Emergency Physician Be Aware of This?: Misdiagnosis can lead to administering the wrong treatment or even unnecessary surgical interventions. Intestinal angioedema is best treated with purified C1-inhibitor, icatibant, or ecallantide. Fresh frozen plasma is to be avoided because it carries the risk of worsening the symptoms. (C) 2016 Elsevier Inc.