If your kidneys are damaged and not working right, you are at greater risk for other health issues. Kidney disease makes you more vulnerable and increases your chances of developing heart diseases and stroke. The kidneys also help make red blood cells that carry oxygen throughout the body. In case your kidneys aren't working normally then your red blood cell levels can drop too low resulting in anemia. Kidneys also keep phosphorus and potassium at a healthy level in your body. Too much of either of these nutrients can build up in your blood if you have kidney disease. High phosphorus levels can drain the bones of calcium and weaken them. High potassium levels can also increase your risk for heart rhythm problems that can be dangerous.