15 Signs That Your Kidneys Aren’t Working Properly

11. Confusion

If your brain is feeling a bit fuzzy, and you’re just not at your sharpest mentally, this could be a sign of a kidney problem. According to a 2012 study from Temple University, decreased kidney function is strongly correlated with cognitive impairment and verbal memory issues. And, according to Twardowski, high calcium levels caused by kidney cancer can result in feelings of confusion.