Kidney stones not kill by themselves but they can cause problems and complications which may kill someone if not treated quickly. For example, the stones may obstruct the kidneys which may cause the urine to become so infected that the bacteria gets into the blood stream and gets all over the body. This is called sepsis. It can also kill someone by blocking the ureter in a person who has only one kidney. There can be other ways in which the stones can damage your kidneys.