Healthy bladder control depends on coordinated function between the pelvic floor muscles, urinary sphincter, and nervous system. The pelvic floor muscles contract approximately 11,000 times per day to maintain continence. When these muscles weaken below a functional threshold, involuntary leakage occurs during physical stress or sudden urge signals.
Stress incontinence develops when weakened pelvic floor muscles cannot adequately support the bladder neck during increased abdominal pressure from coughing, sneezing, laughing, or exercise. Urge incontinence occurs when the detrusor muscle contracts involuntarily, creating sudden and intense signals that override normal sphincter control.
Mixed incontinence, the most common presentation, combines both mechanisms. Factors such as pregnancy, childbirth, hormonal changes during menopause, prostate surgery, and chronic conditions like obesity compound muscle deterioration and nerve dysfunction over time.
