Urologist is a specialist that specializes in diagnosing and treating the diseases of the urinary tract system. They treat a wide variety of diseases that include any of the organs of the urinary system. These include problems in kidneys like acute kidney disease, chronic kidney failure, diabetic nephropathy, kidney stones, nephrotic syndromes, pyelonephritis, etc. Other diseases including urinary tract infection, urinary tract obstruction, changes in urine characteristics, etc. and those involving the prostate like BPH (Benign Prostatic Hyperplasia), prostate cancer, etc. are also treated by urology doctor.