咯血是指喉及以下的呼吸道任何部位的出血经口排出,它是常见的一个临床症状[1]。咯血是以病史临床症状为诊断依据,但引起咯血病因多种多样,预后各异,因此明确病因是急诊科医生首先要解决的问题。目前影像学检查和纤维支 Hemoptysis is the throat and the following respiratory tract bleeding in any part of the oral discharge, it is a common clinical symptom [1]. Hemoptysis is based on the history of clinical symptoms for the diagnosis, but causes a variety of causes of hemoptysis, the prognosis is different, so a clear cause is the first emergency department doctor to solve the problem. The current imaging examination and fiber branch