Bladder Outlet Obstruction Causes and Considerations

Common Causes in Men

The American Urological Association notes that benign prostatic hyperplasia (BPH) is the most common cause of bladder outlet obstruction (BOO) in men, with prevalence increasing with age, reaching 60% by age 60 and 80% by age 80 1
Prostate cancer can cause obstruction through enlargement of the gland similar to BPH, as reported by The Journal of Urology 2
Urethral stricture, which is narrowing of the urethra due to scar tissue, trauma, or inflammation, is another cause of BOO in men, according to The Journal of Urology 3

Posterior urethral valves are the most common cause of congenital bladder outlet obstruction in male infants, as stated by Pediatrics and the Journal of the American College of Radiology 4, 6
Ureterocele, which is cystic dilation of the distal ureter, can obstruct the bladder outlet, as noted by Pediatrics 6
Ectopic ureter, an abnormal insertion of the ureter, can also cause obstruction, according to Pediatrics 6

Detrusor-sphincter dyssynergia, a lack of coordination between bladder contraction and sphincter relaxation, often due to neurological conditions, can cause BOO, as reported by The Journal of Urology 3, 5
Detrusor underactivity can coexist with BOO and contribute to voiding symptoms, as stated by The Journal of Urology and European Urology 3, 7
Detrusor overactivity is often associated with BOO, particularly in men with BPH, according to The Journal of Urology and European Urology 3, 7

BOO can lead to significant lower urinary tract symptoms (LUTS) that affect quality of life, as noted by Praxis Medical Insights 1
If left untreated, BOO can lead to complications including acute urinary retention (AUR), which increases in incidence with age, as reported by Praxis Medical Insights 8
Upper urinary tract damage can occur in severe cases of BOO, as stated by Pediatrics 6