所谓慢性持续性干咳,是指以干咳为主要症状。持续3周以上,经至少一位胸科医生诊治后,未能明确诊断且症状无明显改善者。近年来有些学者对定义中3周以上这一时间概念提出了不同的看法。认为一般的上呼吸道感染所引起的症状,在个别病例可持续8周,推荐把3周改为8周。本病病因较多,理论上说, The so-called chronic persistent dry cough, dry cough is the main symptom. For more than 3 weeks, at least one chest doctor after treatment, failed to confirm the diagnosis and no significant improvement in symptoms. In recent years, some scholars have come up with different views on the definition of the time in more than three weeks. In general, the symptoms caused by upper respiratory tract infections are considered to be 8 weeks in individual cases and 3 weeks to 8 weeks. Etiology of the disease more, in theory,