咳嗽对人体有一定的保护作用，它可将侵人呼吸道的异物及呼吸道的异常分泌物排出体外，保持呼吸道的畅通。当然咳嗽对人体也有弊，比如，剧烈咳嗽可使患病部位的细菌扩散到周围组织，导致感染面增大；长期咳嗽会使肺泡弹性消失，增进肺气肿的发病速度；有时剧烈咳嗽还容易咳破 Cough on the human body has a protective effect, it can invade the respiratory tract of foreign body and respiratory secretions discharged from the body, to keep the airway open. Of course, there are disadvantages of cough on the human body, for example, severe cough can make the affected parts of the bacteria spread to the surrounding tissue, leading to increased infection; long-term cough alveolar elasticity will disappear to promote the incidence of emphysema; sometimes severe cough is also easy Cough broken