Can Brain Stimulation Reduce Visceral Pain in IBS-D? Low-Frequency rTMS Shows Promise: Gut | September 2026

Introduction:

Chronic visceral pain is one of the most difficult symptoms to treat in diarrhea-predominant IBS (IBS-D). This translational study identified medial prefrontal cortex (mPFC) hyperexcitability as a potential driver of visceral pain and evaluated low-frequency repetitive transcranial magnetic stimulation (rTMS) as a targeted therapy.

How Does It Work?

Neuroimaging showed increased mPFC activity associated with visceral pain.

Mechanistic studies identified hyperactive mPFC glutamatergic neurons, driven partly by input from the anterior cingulate cortex and NR2A-mediated signaling.

Low-frequency rTMS suppressed this hyperexcitability and restored abnormal synaptic plasticity.

What Happened in Patients?

A 2-week course of mPFC-targeted low-frequency rTMS:

Reduced visceral pain

Improved bowel habits

Reduced mPFC activity

Produced benefits lasting at least 8 weeks

Clinical Impact:

The study strengthens the concept of IBS as a disorder of gut–brain interaction, where persistent symptoms may arise partly from abnormal central pain processing.

Targeted neuromodulation could eventually provide a non-pharmacological option for patients with refractory IBS-D and visceral pain.

Caution:

These are early translational findings. Larger, adequately controlled clinical trials are required before rTMS can be incorporated into routine IBS management.

Bottom Line:

mPFC hyperexcitability may be an important driver of visceral pain in IBS-D. Low-frequency rTMS targeting this region reduced pain and improved bowel symptoms, providing a promising mechanism-based neuromodulation strategy that now requires larger clinical validation.