The local inhabitants had a high incidence of endemic fluorosis for drinking the high fluorine content groundwater that widely distributed in southeast of Ningxia, especially in Yanchi County.

• 宁夏东南部地区由于高氟地下水广泛分布，当地居民长期饮用高氟水导致地氟病发病率非常高，尤以盐池县为甚。