痰是气管、支气管或肺泡黏膜分泌出来的黏液。产生痰是人体呼吸道排污的结果。正常情况下,进入呼吸道的颗粒物、病毒、细菌会被黏液黏住,此时气管中的小纤毛就像麦浪一样做纤毛运动,慢慢将这些脏东西推出来。更多的时候,黏液会在不知不觉中吞咽下去。当黏膜免疫功能失调时,会导致黏液的功能下降,就会分泌更多的黏液来参与“保护运动”。于是,人就感觉到了痰多。健康的人一般是不 Phlegm is tracheal, bronchial or alveolar mucus secreted mucus. Sputum is the result of the respiratory tract of the human body. Under normal circumstances, enter the respiratory tract particles, viruses, bacteria will be sticky mucus, then the trachea like cilia like cilia doing ciliary movement, and slowly push out these dirty things. More often, mucus swallows unconsciously. When mucosal immune dysfunction, it will lead to decreased mucus function, it will secrete more mucus to participate in “protection of movement ”. So, people feel the sputum. Healthy people are generally not