The document discusses chronic kidney disease of unknown etiology (CKDu). It begins by introducing kidney functions and defining CKDu. It then lists major causal factors as fixed factors, behavioral factors, and biomedical factors. For the Sri Lankan situation, it notes CKDu was identified in 2000 and discusses hotspot districts. It explores possible roles of cadmium, uranium, fluoride, mycotoxins, aluminum utensils, and other factors in CKDu. The document suggests awareness raising, multidisciplinary research, following agrochemical recommendations, and promoting water filtering as steps to address CKDu.