Behçet's disease (BD) is a rare disease, characterized by chronic perivascular inflammation, recurrent oral and genital ulcers, ocular inflammation and multisystemic involvement due to vasculitis. It is more common in countries along the old Silk Road such as Turkey, Greece, and Israel. The etiology is unknown, while epidemiologic data point to the role of both genetic and environmental factors. 1,2 BD usually presents at third to fourth decades and is rare in children. Vasculitis in BD can affect both arteries and veins; however, venous involvement is more common. Although the most common arterial involvement is pulmonary artery aneurysm (PAA), it occurs very rarely in BD. In a retrospective analysis, the prevalence of pulmonary artery involvement including PAA and pulmonary artery thrombosis was found to be 2%. 3 To our knowledge, there is no data about the prevalence of PAA in children with BD. Patients with PAA usually present with hemoptysis and carry a high risk of mortality. 4 It should be kept in mind that some life-threatening features in the pediatric population may occur earlier than mucocutaneous findings. In this article, we report an adolescent diagnosed with BD to emphasize the importance of vascular etiologies such as BD in the differential diagnosis of hemoptysis even in the pediatric age group.