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黄痰是热,白痰是寒?坦言:咳出4类痰液,需注意肺部健康
痰液是由上呼吸道和下呼吸道粘膜细胞分泌的一种黏稠液体,含有水分、蛋白质、盐和微量元素等成分。 当呼吸道受到病毒、细菌等感染,或者过敏、污染等外界刺激时,会刺激粘膜细胞分泌更多的痰液来保护呼吸道。
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