Kidney stones result from crystals in the urine aggregating together when the urine becomes highly concentrated. Normally these crystals pass through the urinary tract without problems. Occasionally, if these stones become large enough, they cause obstruction of the kidney drainage system which may result in severe pain, bleeding, infection or kidney failure.
The invasion and propagation of disease causing organisms in the body is known as an infection. Infection may be restricted to a particular location or may spread throughout the entire body. Infection of the prostate gland is often described as prostatitis. The condition caused by infection with bacteria is called bacterial prostatitis.