Four Main Causes of Weak Pelvic Floor Muscles

Author: Samantha Chow, Registered Physiotherapist | Women's Health

The pelvic floor muscles are located at the base of the pelvis, supporting the urethra, bladder, uterus/prostate, and rectum like a "hammock." They are also involved in urinary and fecal continence, sexual function, and postural stability. When the strength, endurance, or coordination of the pelvic floor muscles decline, problems such as urinary incontinence, fecal incontinence, pelvic organ prolapse, pelvic pain, and sexual dysfunction may arise. Here are four common causes:

Pregnancy and Childbirth

During pregnancy, an enlarged uterus and increased weight raise intra-abdominal pressure; hormones like relaxin make ligaments and connective tissues more lax; and vaginal delivery can cause stretching or damage to the pelvic floor muscles, fascia, and pudendal nerves. Episiotomy, forceps/vacuum-assisted delivery, prolonged second stage of labor, macrosomia, and early postpartum coughing or constipation all increase the risk.

Common manifestations: postpartum stress urinary incontinence, urgency, prolapse sensation (heaviness), lumbopelvic instability.

Aging and Hormonal Changes

With increasing age, muscle mass and neuromuscular control decline; after menopause, estrogen levels decrease in women, leading to poorer blood flow and elasticity of vaginal and urethral tissues, and a reduction in pelvic support and closing pressure. Men may also experience weakened pelvic floor function and urinary incontinence after prostate surgery.

Common manifestations: mixed stress and urge urinary incontinence, increased nocturia, worsening prolapse.

Chronic Activities or Conditions that Increase Abdominal Pressure

Chronic constipation and straining during bowel movements, prolonged chronic coughing (e.g., allergies, asthma, smoking-related bronchitis), obesity, long-term heavy lifting or high-impact exercise, incorrect core training (excessive breath-holding and straining), prolonged holding of urine or stool.

Mechanism of impact: Repeatedly elevated intra-abdominal pressure exceeding the pelvic floor's tolerance leads to increased risk of muscle weakness, fascial laxity, and organ prolapse.

Genetic Predisposition and Connective Tissue Characteristics

Congenitally lax connective tissue or poor collagen structure (e.g., hypermobility, certain connective tissue disorders) reduces the tension and elasticity of fascia and ligaments, increasing the risk of prolapse and incontinence. Family history may also increase susceptibility.

Recommendation: Establish preventive training early, avoid long-term high intra-abdominal pressure activities, and discuss supportive devices with a professional if necessary (e.g., vaginal pessary for women).

Other Common Influencing Factors

• Pelvic surgery or radiotherapy (e.g., prostatectomy, gynecological surgery)
• Neurological disorders (e.g., stroke, multiple sclerosis, diabetic neuropathy)
• Prolonged sitting, poor postural control, insufficient physical activity
• Psychological stress and overly tense pelvic floor (not just "too weak," but also potentially "too tight to relax," manifesting as urgency, pain, painful intercourse, etc.)
• Actionable Advice

Pelvic floor muscle weakening is often caused by a complex interplay of multiple factors. Early identification of the causes and implementation of corresponding strategies can significantly reduce discomfort and improve quality of life. If you experience urinary incontinence, a sensation of prolapse, pelvic pain, or postpartum concerns, it is recommended to consult a doctor or physiotherapist specializing in pelvic health for individualized assessment and training to restore pelvic health.

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