Also known as: BPH, benign prostatic hypertrophy, prostatic enlargement, LUTS, lower urinary tract symptoms
Overview
Histologic diagnosis of hyperplasia of prostatic stromal and epithelial cells, typically producing transitional zone enlargement and bladder outlet obstruction with lower urinary tract symptoms (LUTS).
Epidemiology
Histologic BPH present in ~50% of men over 50 and ~80% over 80; ~25-30% experience moderate-to-severe LUTS.
Try two board-style Benign Prostatic Hyperplasia questions
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Question 1ReproductiveMedium
A 67-year-old man has urinary hesitancy, weak stream, and nocturia with a smooth enlarged prostate. PSA is appropriate for age. Which of the following medication mechanisms most rapidly relieves his symptoms?
AMuscarinic receptor blockade
BAlpha-1 adrenergic blockade
CAndrogen receptor blockade
D5-alpha reductase inhibition
Reveal answer & full explanation
Correct answer: B — Alpha-1 adrenergic blockade
AMuscarinic receptor blockade
BAlpha-1 adrenergic blockade✓
CAndrogen receptor blockade
D5-alpha reductase inhibition
Why Alpha-1 adrenergic blockade is correct
A smooth, symmetrically enlarged prostate with obstructive voiding and age-appropriate PSA indicates benign prostatic hyperplasia.
Alpha-1 blockers relax prostatic and bladder-neck smooth muscle, improving flow within days, the fastest-acting option.
This dynamic relaxation, not gland shrinkage, accounts for the rapid relief.
Why the others are wrong
5-alpha reductase inhibition — finasteride and dutasteride are genuine BPH therapy, but they shrink the gland over 6 to 12 months and provide no rapid symptom relief.
Androgen receptor blockade — antiandrogens are prostate cancer agents with no role in benign prostatic hyperplasia, and any effect on gland volume would take months.
Muscarinic receptor blockade — antimuscarinics address storage symptoms such as urgency and frequency and can precipitate retention in a man with outlet obstruction.
Question 2ReproductiveMedium
A 67-year-old man has hesitancy, weak stream, nocturia, and incomplete emptying. Prostate is enlarged and smooth. Which of the following best explains the pathophysiology?
ADetrusor failure from chronic denervation
BMalignant invasion of prostatic capsule
CBacterial infection of prostatic tissue
DDihydrotestosterone-driven hyperplasia
Reveal answer & full explanation
Correct answer: D — Dihydrotestosterone-driven hyperplasia
ADetrusor failure from chronic denervation
BMalignant invasion of prostatic capsule
CBacterial infection of prostatic tissue
DDihydrotestosterone-driven hyperplasia✓
Why Dihydrotestosterone-driven hyperplasia is correct
Smooth, symmetric prostatic enlargement with obstructive lower urinary tract symptoms in an older man is benign prostatic hyperplasia.
The driver is androgen-dependent (dihydrotestosterone) hyperplasia of periurethral stromal and epithelial tissue, which narrows the urethral channel.
This explains why 5-alpha-reductase inhibitors, which block conversion of testosterone to DHT, shrink the gland.
Why the others are wrong
Malignant invasion of prostatic capsule — Prostate cancer typically gives a hard nodule, asymmetry, or rising PSA, not a uniformly smooth gland; assuming cancer is the missed-the-smooth-exam trap.
Bacterial infection of prostatic tissue — Prostatitis adds fever, dysuria, and an exquisitely tender boggy gland; the painless chronic course here makes infection the wrong-tempo trap.
Detrusor failure from chronic denervation — A failing bladder gives a flaccid, non-enlarged gland and overflow without the firm symmetric hyperplasia; this is the wrong-organ trap.
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Age-related hormonal changes (rising estrogen-to-testosterone ratio, continued local DHT production via 5-alpha-reductase) drive nodular hyperplasia in the transitional zone, compressing the prostatic urethra. Alpha-1-adrenergic tone in prostatic smooth muscle contributes to dynamic obstruction (vs static obstruction from gland size).
Reduces risk of acute urinary retention and need for surgery
Reduces PSA by ~50% — multiply measured PSA by 2 for cancer screening interpretation
Side effects: sexual dysfunction (decreased libido, ED, ejaculatory disorders), gynecomastia
Combination therapy
Alpha-blocker + 5-ARI (e.g., tamsulosin + dutasteride) — superior to monotherapy for moderate-to-severe symptoms with prostate enlargement (MTOPS, CombAT trials)
Use for at least 1 year for full benefit
Other pharmacologic options
PDE5 inhibitor — tadalafil 5 mg daily — useful when ED coexists
Anticholinergics or beta-3 agonists (mirabegron) — if overactive bladder symptoms predominate; caution if elevated PVR
Endoscopic: transurethral resection of the prostate (TURP) — historical gold standard; transurethral incision of prostate (TUIP) for small glands
Laser enucleation (HoLEP, ThuLEP) — for very large prostates
Open or robotic simple prostatectomy — for very large (>80-100 g) prostates
Complications
Acute urinary retention (AUR) — sudden inability to void, painful distended bladder; treat with catheter, alpha-blocker; trial of void after 3-7 days
Recurrent UTI
Bladder stones, hematuria
Bladder decompensation, hydronephrosis, postrenal AKI
Surgical complications: bleeding, retrograde ejaculation (~70% after TURP), urinary incontinence, urethral stricture, TUR syndrome (hyponatremia from monopolar irrigation)
PANCE pearls
5-alpha reductase inhibitors reduce serum PSA by ~50%; double the measured PSA when screening men on finasteride/dutasteride.
Alpha-blockers can cause intraoperative floppy iris syndrome — alert ophthalmology before cataract surgery; effect can persist for weeks after discontinuation.
Acute urinary retention is treated with urethral catheterization; do NOT rapidly decompress >1 L (can cause hematuria, hypotension) — use intermittent clamping.
Avoid anticholinergics, opioids, decongestants, and antihistamines in BPH patients — can precipitate retention.
Daily tadalafil 5 mg is approved for both BPH and ED — useful when both conditions coexist.
Combination therapy (alpha-blocker + 5-ARI) is best for men with large prostates and bothersome symptoms; expect at least 6-12 months for full effect of 5-ARI.
BPH ≠ prostate cancer — discuss separate cancer screening based on patient preferences and risk.
References
AUA 2023 — Management of Benign Prostatic Hyperplasia: AUA Guideline (Sandhu et al., J Urol 2023)
MTOPS — The Long-term Effect of Doxazosin, Finasteride, and Combination Therapy on the Clinical Progression of BPH (McConnell et al., NEJM 2003)
CombAT — Dutasteride plus Tamsulosin Combination Treatment in Men with BPH (Roehrborn et al., Eur Urol 2010)
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