鼻出血是耳鼻咽喉科常见急症之一,病因比较复杂,某些全身和局部疾病均可引起,也有部分病人原因不明。鼻腔任何部位都可发生出血,儿童绝大多数在鼻腔前部,年青人以鼻腔前部多见,也有少数在鼻腔后部,中年以上患者则以鼻腔后部较多。鼻腔后部出血,血液多经鼻后孔流入咽部,从口内吐出,故称鼻后孔出血。临床上发病率较高。关于出血部位,Woodruff认为在下鼻甲后端之下鼻道外侧处,该处有怒张的静脉与蝶腭动脉分支构成鼻咽血管丛。中年 Epistaxis is one of the common emergency of otolaryngology, the cause is more complicated, some systemic and local diseases can cause, but also some patients for unknown reasons. Nasal bleeding can occur in any part of the vast majority of children in the nasal front, young people more common in the front of the nasal cavity, but also a few in the nasal back, middle-aged patients with nasal rear more. Nasal bleeding at the back, the blood flow through the posterior orifice of the nose and throat, spit out from the mouth, it is called the posterior orifice of the nose bleeding. Clinical incidence is higher. With regard to the site of bleeding, Woodruff concluded that at the lateral nasal passages below the posterior end of the inferior turbinate, there is an anovulatory vein and a branch of the sphenopalatine artery forming the nasopharyngeal vascular plexus. middle aged