Cashews Can Cause Gallstones
Another serious issues linked to consuming high concentration oxalic acid is that it could form gallstones in the body. A gallstone is a small, hard crystalline mass formed abnormally in the gallbladder or bile ducts from bile pigments, cholesterol, and calcium salts. Gallstones can cause severe pain and blockage of the bile duct.
http://llufb.llu.lv/conference/foodbalt/2014/FoodBalt_Proceedings_2014-321-323.pdf
http://developtrust.empowernetwork.com/blog/health-risks-of-cashew-nuts