To the editor, Behçet's disease (BD) is an inflammatory disorder characterized by recurrent oral and genital ulcers, ocular and skin lesions, and it may be accompanied by vascular, neurological, or gastrointestinal involvement (1). In BD, gastrointestinal (GI) tract involvement is seen about 3%-25% of the patients. GI disease usually affects not only the ileocecal area, but also rarely involves the esophagus, small intestine, and colon (1). The most common GI symptoms are abdominal pain, diarrhea, and bleeding. Deep ulcers in the GI tract that are seen in BD are the major causes of severe complications, such as severe bleeding and perforation. There are only a few studies that have reported colonic perforations due to BD (2, 3). In this article, we report a patient with BD who underwent an emergent operation because of acute abdomen, developing secondary to multiple perforations of the ascending colon and terminal ileum.A 26-year-old male patient was admitted to the emergency department of our hospital complaining of abdominal pain, bloody diarrhea, nausea, and poor appetite for ten days. His medical history revealed that 11 years ago he was diagnosed with BD, according to the international criteria for BD. He had characteristic mouth sores, skin lesions, arthritis, and deep venous thrombosis at onset. On physical examination, there was hyperactivity of bowel sounds, tenderness on the lower quadrants, tachycardia (113/min), and subfebrile fever (37.5˚C). There was no rebound tenderness or guarding on abdominal examination. Laboratory tests revealed increased white blood cells count and creatinine (14400/mm 3 and 1.96 mg/dL, respectively).