Straining to Pass Urine in Men with Lower Urinary Tract Symptoms

Area of Science:

• Urology
• Physiology

Background:

• Straining to void is commonly considered a sign of bladder outlet obstruction (BOO) in men experiencing lower urinary tract symptoms (LUTS).
• The precise physiological role and diagnostic significance of straining during micturition remain incompletely understood.

Purpose of the Study:

• To review the physiological role of straining during the voiding cycle.
• To evaluate the current evidence linking straining to bladder outlet obstruction (BOO).

Main Methods:

• Systematic review of existing literature.
• Analysis of studies comparing patient-reported straining with urodynamic findings.
• Examination of straining prevalence in obstructed versus unobstructed individuals.

Main Results:

• Patient-reported straining shows poor correlation with objective urodynamic findings.
• The prevalence of straining does not significantly differ between men with and without BOO.
• Straining can persist after successful surgical relief of BOO, suggesting non-obstructive causes.

Conclusions:

• Straining is a non-specific symptom with limited diagnostic value for identifying BOO.
• The symptom may reflect behavioral or compensatory mechanisms rather than mechanical obstruction.
• Clinical interpretation of straining should be combined with objective urodynamic assessments for accurate diagnosis.