Its cause was mercury pollution. Chisso, a company discharged the liquid to the sea. A lot of fish were polluted by mercury and many people ate the fish, so many people caught the disease. Many people couldn't move, hear, and so on. In heavy case, people died. Until now, some people are feeling pain.
All companies shouldn't have discharged dangerous materials, but now in Japan, the action is banned by laws. So, we mastn't cause problems like this.
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