中医讲"肾藏精生髓,髓聚而为脑",所以肾虚可致髓海不足,脑失所养,出现头晕、耳鸣。肾除了包罗了西医学所说的肾脏的功能外,又有藏精、主管命门之火,主持生殖、生长、发育,主水,主纳气,调节水液代谢的作用,因此肾在中医学中被称为"先天之本"、"生命之根。"它在人的生命历程中起着至关重要的作用。
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