Benign prostatic hyperplasia is a condition in which the prostate gland in men enlarges, but is not cancerous. Normally, the prostate goes growth two main periods during the age of men. The first one is around puberty, when the gland grows twice the size of the origins. The second one is around the age of 25, which continues for the whole life. Prostate enlargement or benign prostatic hyperplasia begins with the second growth phase.

As the prostate enlarged, the gland presses against the urethra, causing it to narrow down. The bladder, on the other hand, turns thicker. In response to the weakness of the bladder, a person may lose the tendency to urinate normally like some of the urine still stays in the bladder, even if urinate properly. The narrowing of the urethra and the inability of the bladder to empty itself causes many of the complications linked to benign prostatic hyperplasia.