Cough in winter, most of them belong to stagnation of qi. It's often due to poor health or bad living 
habits.In autumn, the lung system is attacked by external pathogens, but when it is infected by external pathogens in autumn, it doesn't attack immediately. Therefore, exogenous pathogens lie in wait for the lung system, or the lung system has been slightly damaged or infected. When winter comes, people often cough, and medication has little effect. This is one of the most common diseases of stagnation of qi.
冬季咳嗽，大多数都属于伏气病。往往是体质差，或者是生活保养不注意，在秋季的时候，肺系统受到外邪的侵袭，但是在秋季受外邪感染的时候，并没有立即发作出来。于是外邪就依附肺系统埋伏了下来，或者肺系统已经受到轻度的损伤，感染等情形，等到了冬季的时候就经常咳嗽，用药也收效甚微，这就是一种最为常见的伏气病。
（图源网络，侵删！）
