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１引言 咯血是指喉及喉以下的呼吸道（包括气管、支气管和肺组织）任何部位的出血，并经口腔排出。咯血是常见的临床表现。２咯血的病因 引起咯血的疾病很多，最常见的是呼吸系统疾病，其次是循环系统疾病。呼吸系统疾病主要包括支气管与肺部疾病。支气管疾病较常见的有支气管
1 Introduction Hemoptysis refers to the bleeding of any part of the respiratory tract (including the trachea, bronchi, and lung tissue) below the larynx and larynx and excreted through the mouth. Hemoptysis is a common clinical manifestation. 2 The cause of hemoptysis There are many diseases that cause hemoptysis, the most common are respiratory diseases, followed by circulatory diseases. Respiratory diseases mainly include bronchial and pulmonary diseases. More common bronchial disease bronchus