Conclusions: The main causes of chronic cough in children were mycoplasma pneumoniae infection, cough variant asthma, tuberculosis and postnasal drip syndrome.

• 结论：儿童慢性咳嗽以肺炎支原体感染、咳嗽变异性哮喘、结核感染、鼻后滴流综合征为主要原因。