A urologist is a physician whose specialty is maintaining and studying the male reproductive system and the urinary tracts of both men and women. These specialists are certified in diagnosing and treating many conditions in the genitourinary tract, which encompasses the kidneys, urinary bladder, ureter, urethra, adrenal glands. A urologist also studies and deals with the male reproductive organs— penis, prostates, testicles, epididymis, seminal vesicles, vas deferens, etc. A urologist can also specialize in male fertility as well, performing vasectomies, vasectomy reversals. Urologists treat disorders such as urinary tract infections (UTI), kidney stones hematuria (blood in the urine), kidney cancer, stress incontinence, benign prostatic hyperplasia, erectile dysfunction, prostate cancer, testicular cancer, and cystitis.