Kidneys are a pair of organs situated bellow the ribs, near the middle of the back. Their function would be to get rid of wastes and unnecessary liquids from human body within the form of urine. Glomerulonephritis and bacterial pyelonephritis are probably the most common problems from the kidneys. These problems are the result of various type of infections like pneumonia, syphilis, malaria, hepatitis or even urinary tract infections or prostate growth.