Rectal Prolapse Causes and Risk Factors
Pathophysiology and Risk Factors
- Chronic straining during defecation and conditions causing chronic increases in intra-abdominal pressure are the primary causes of rectal prolapse, leading to weakening of pelvic floor support structures 1
- Direct or denervation injury to the pelvic floor musculature increases stress on the fascia and leads to progressive weakening of pelvic floor support 1
- Key risk factors include advanced age, menopause, vaginal multiparity, obesity, chronic straining, and any conditions resulting in chronic increases in intra-abdominal pressures 1
Clinical Context
- When the pelvic floor is weakened by chronic straining, external prolapse is frequently complicated by fecal incontinence due to mechanical stretching and damage of the anal sphincters over time 2
Important Clinical Pitfalls
- The American Gastroenterological Association recognizes that attributing rectal prolapse solely to constipation without recognizing the broader context of chronic straining is a clinical pitfall, and that the actual mechanism is the repetitive straining behavior, which can occur with various defecatory disorders including paradoxical pelvic floor contraction (dyssynergia) 3
Complete Full-Thickness Rectal Prolapse: Epidemiology and Risk Factors
Introduction to Rectal Prolapse
- The American Society of Colon and Rectal Surgeons suggests that rectal prolapse is more common in elderly patients, with a prevalence of 1% in adults over 65 years, indicating age as a risk factor rather than a direct cause 4, 5
- The World Gastroenterology Organisation notes that rectal prolapse can occur at the "extremes of life", with congenital pelvic floor weakness being relevant primarily in pediatric populations 4, 5
Epidemiology
- The incidence of rectal prolapse is approximately 2.5 per 100,000 inhabitants, with a women:men ratio of 9:1, supporting the role of multiparity and chronic straining as causative factors 4, 5
- The American Gastroenterological Association recommends recognizing the broader context of rectal prolapse, including the repetitive straining behavior that can occur with various defecatory disorders, rather than attributing it solely to "constipation" 6, 7