A Urologist is a surgeon who deals with the disease of the urinary tract in males and females and the genital tract of the males. The common diseases treated by urologist include Urinary Tract Infections (UTI), Kidney stones, Prostate enlargement,  Cancers of the kidney, prostate, bladder, penis and other urinary organs, Genital problems such as infertility, varicocele and vasectomy reversal.