铬参与人体糖和脂肪代谢，对人体的健康有着重要的生理功能，是人体的必需微量元素，铬最常见的氧化态是+2、+3和+6价，只有三价铬是人体必需的，但是过量摄入对人体也会造成危害。自然界中的铬以三价最稳定。生物体内三价铬也是最为稳定的存在形式，这是因为三价铬很容易和配位体生成一种比较稳定的络合物。
铬的毒性与存在的价态有关，二价铬毒性非常轻微；六价铬是一种强氧化剂，对人体有毒，并易被人体吸收且在体内蓄积，三价铬和六价铬可以相互转化，六价铬比三价铬毒性高100倍。
在临床上，六价铬及其化合物对于人体的伤害，通常表现在三个方面：一是损害皮肤，导致皮炎、咽炎等；二是损害呼吸道系统，引发肺炎、气管炎等；三是损害消化系统，误食甚至长期接触铬酸盐，极易造成胃炎、胃溃疡等。
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