Prostate enlargement is the increase in size of the prostate gland. This is a male-specific gland located below the bladder, around the urethra (the duct by which urine is expelled out of the body). Prostate enlargement causes difficulty in urination as its development gradually blocks the urethra, and consequent blockage of urine passage. This blockage may lead to urinary tract infections or kidney related medical conditions.It is usually considered a benign, age-related disease, prevalent among men over fifties.