Benign prostatic hyperplasia (BPH), also known as benign prostatic hypertrophy or benign prostatic obstruction, is a common problem in aging men, referring to the nonmalignant enlargement of the prostate. The enlarged prostate gland presses against the urethra, and the bladder wall thickens. The bladder may eventually become weak, leading to urinary retention (inability to empty completely). Urinary retention and narrowing of the urethra are the causes of problems associated with BPH. 

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