一般来说,健康的人痰很少,只是我们的身体为了保持呼吸道湿润而分泌的少量黏液,
但是当我们生病时,呼吸道发生炎症或者是主呼吸的肺出了问题,呼吸道就会分泌更多的痰量,
而痰的性质也会发生变化,可以由黏痰变成黄脓痰。
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