Cadmium is a heavy metal, except it can cause acute and chronic poisoning, it also can cause teratogenic, cancer and mutation.

镉是一种重金属毒物，除可造成急、慢性中毒，还有一定致畸、致癌和致突变作用。

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In China, many areas have the problems of the parcel groundwater contain too much arsenic, and it leads parcel arsenical chronic poisoning.

在中国，很多地区存在局部地下水含砷量过高的问题，导致地方性砷中毒。

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However, as mercury can be found in most fish, one risks excessive intake of mercury by eating too much deep sea fish, leading to chronic poisoning.

然而，很多鱼都含水银，常吃大量深海鱼，便有机会摄取过量水银，长远可引致慢性中毒。

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But subsequent medical tests cleared him of any acute or chronic arsenic poisoning.

CNN: All Over But the Verdict

Its report found "no conclusive link" between the water poisoning incident and the chronic symptoms and diseases reported.

BBC: Lowermoor treatment works, Camelford