The Overlooked Cause of Chronic Bloating

You have tried the low-FODMAP diet. You have eliminated gluten and dairy. You have taken probiotics, digestive enzymes, and peppermint oil. Your stool tests are normal. Yet the bloating persists, often worsening as the day progresses and reaching its worst by evening. If this describes your experience, there is a cause that most gastroenterologists, dietitians, and wellness practitioners rarely discuss: pelvic floor dysfunction.

The pelvic floor is a group of muscles that forms a hammock-like structure at the base of the pelvis. These muscles support the bladder, rectum, and uterus (in women), and they play a critical role in defecation, urination, and core stability. When these muscles become dysfunctional — either too tight (hypertonic) or too weak (hypotonic) — the effects on digestion can be profound and are frequently misattributed to other causes.

How the Pelvic Floor Causes Bloating

Dyssynergic Defecation

The most direct mechanism linking the pelvic floor to bloating is dyssynergic defecation (also called pelvic floor dyssynergia). Normal defecation requires a coordinated sequence: the abdominal muscles contract to increase intra-abdominal pressure while the pelvic floor muscles and external anal sphincter relax to allow stool to pass. In dyssynergia, this coordination breaks down — the pelvic floor muscles paradoxically contract instead of relaxing during the attempt to defecate.

The result is incomplete evacuation, straining, a sensation of blockage, and the need for digital assistance in some cases. The retained stool in the rectum and sigmoid colon leads to continued bacterial fermentation, gas production, and progressive distension — which manifests as bloating that builds throughout the day.

Abdominophrenic Dyssynergia

Research published in Gastroenterology has identified a specific pattern called abdominophrenic dyssynergia in patients with functional bloating. In this pattern, when gas or content enters the intestine, the diaphragm descends (contracts downward) and the anterior abdominal wall relaxes instead of maintaining tone. This creates visible abdominal distension even when the actual volume of gas is normal. The bloating is real and visible, but it is caused by abnormal muscular responses rather than excessive gas production.

Up to 50% of patients with chronic constipation may have pelvic floor dyssynergia as a contributing factor. It is consistently underdiagnosed because standard gastroenterological investigations (colonoscopy, blood tests, stool tests) do not assess pelvic floor function. If your bloating has resisted every dietary and supplement intervention, a pelvic floor assessment may be the missing piece.

Signs That Your Bloating May Be Pelvic Floor Related

  • Bloating worsens significantly from morning to evening
  • You feel like you never fully empty your bowels
  • You strain excessively during bowel movements
  • You sometimes need to use manual pressure on your perineum or vagina to assist defecation
  • You experience urinary symptoms alongside digestive ones (urgency, frequency, incomplete emptying)
  • Your bloating is worse during your menstrual period
  • You have pain during intercourse
  • Dietary changes have not meaningfully improved your bloating
  • You have a history of pregnancy, childbirth trauma, pelvic surgery, or chronic straining

Diagnosis

Pelvic floor dysfunction is diagnosed through specific tests that your gastroenterologist can order but that are not part of routine investigation:

  • Anorectal manometry — measures the pressures generated by the pelvic floor muscles and sphincters during rest, squeeze, and simulated defecation
  • Balloon expulsion test — a simple test where a small balloon filled with water is placed in the rectum and you are asked to expel it. Inability to expel within a specified time suggests dyssynergia
  • Defecography — an imaging study that visualises the pelvic floor anatomy and function during defecation
  • EMG (electromyography) — measures electrical activity in the pelvic floor muscles to identify paradoxical contraction patterns

Treatment: Pelvic Floor Physical Therapy

The primary treatment for pelvic floor dysfunction is specialised pelvic floor physical therapy, performed by a physiotherapist with specific training in this area. Treatment typically includes biofeedback training to retrain muscle coordination, manual therapy to release hypertonic muscles, specific stretching and strengthening exercises, breathing retraining to coordinate the diaphragm and pelvic floor, and defecation posture optimisation (including the use of a squatting stool).

Clinical studies consistently show that pelvic floor physical therapy with biofeedback improves symptoms in 70-80% of patients with dyssynergic defecation, making it one of the most effective treatments for this type of chronic bloating and constipation.

Connecting the Dots

If you suspect pelvic floor involvement in your bloating, tracking the specific pattern of your symptoms can provide valuable diagnostic information for your healthcare provider. GutIQ helps you document the timing, triggers, and severity of your bloating, creating a symptom profile that can help clinicians distinguish pelvic floor-related bloating from dietary or microbiome-driven causes and guide you toward the most appropriate assessment.