A urologist is a doctor who specializes in the urinary tract and reproductive system. They diagnose and treat conditions that affect the kidneys, bladder, and male and female reproductive systems. 

Urinary tract infections: Infections that affect the urinary tract
Kidney stones: Mineral deposits that can cause pain and difficulty urinating
Bladder control problems: Incontinence or involuntary loss of bladder control
Prostate issues: Enlarged prostate or other prostate problems
Male infertility: Problems that prevent a man from conceiving a child
Urinary tract cancers: Cancers of the bladder, kidneys, prostate, and testicles