Stress incontinence is most commonly caused by weakness of which musculature?

• A. Abdominal muscles
• B. Pelvic floor musculature
• C. Gluteus maximus
• D. Hip adductors

Answer: (B)

Stress incontinence results when the pelvic floor muscles fail to provide adequate support for the bladder and urethra, so urine leaks with activities that raise intra-abdominal pressure (like coughing or sneezing). The pelvic floor forms a supportive sling around the urethra and bladder neck, helping maintain urethral closure as pressure increases. When this musculature is weak, the urethra loses supportive support and can’t stay closed during stress, leading to leakage. Abdominal muscles influence intra-abdominal pressure but aren’t the primary continence mechanism, and gluteus maximus or hip adductors don’t directly control urethral closure. So the pelvic floor musculature is the key player here, and strengthening it is the main therapeutic focus.