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病因慢性支气管炎(简称慢支)的病因目前尚未完全明了,但根据大量研究资料证明,它是由于多种因素综合作用的结果.归纳起来不外乎外因和内因两个方面.一、外因:1、理化因素:主要有大气污染和职业因素包括烟雾、粉尘和有害气体(如二氧化硫、二氧化氮、甲醛、硫化氢、臭氧、氯气等)的长期刺激,或气候突变(如风速过大和冷空气的刺激)及吸烟,均可诱发支气管粘膜的慢性炎症.在国外曾出现过因严重大气污染而造成心肺疾病病人大量死亡的重大事故.据统计,吸烟者比不吸烟者的发病率高5～8倍,且吸烟时间越长,吸烟量越大,发病率越高,病情也较重.因烟中含有尼古丁、镉等多种对人体有害的物质,长期吸烟可削弱呼吸道吞噬细胞的吞噬能力,并使支气管粘膜的柱状上皮细胞鳞状化
Etiology Chronic bronchitis (referred to as chronic bronchitis) etiology is not yet fully understood, but according to a large number of research data show that it is due to the combined effect of many factors .To sum up nothing more than external and internal factors in two aspects .External factors: 1. Physical and Chemical Factors: There are mainly long-term stimuli of air pollution and occupational factors including smoke, dust and harmful gases such as sulfur dioxide, nitrogen dioxide, formaldehyde, hydrogen sulfide, ozone, chlorine, etc., or sudden changes in climate such as wind speed Air stimulation) and smoking, can induce chronic bronchial mucosal inflammation in foreign countries have occurred due to serious air pollution caused by a large number of deaths of patients with major cardiovascular disease accidents.According to statistics, smokers than non-smokers, the incidence of 5 ~ 8 times, and the longer the time of smoking, the greater the amount of smoking, the higher the incidence, the condition is also heavier.For the smoke contains nicotine, cadmium and other harmful substances, long-term smoking can weaken the phagocytosis of respiratory phagocytes Ability, and bronchial mucosa of the columnar epithelial cells squamous