Gut Microbiome Indicates Risk of Chronic Pain, Study Shows

May 7, 2025

New AI Research on Chronic Pain Diagnosis

Summary: Recent studies reveal that artificial intelligence (AI) can accurately identify complex regional pain syndrome (CRPS) by analyzing gut microbiome patterns, achieving over 90% accuracy. Regardless of geographical and dietary differences, a common “microbiome signature” was observed among patients from both Israel and Canada.

Interestingly, even patients who had their CRPS symptoms resolve after limb amputation displayed this microbiome pattern, hinting at a potential underlying vulnerability. These insights could lead to microbiome-based diagnostic methods, potentially enabling earlier and more precise recognition of CRPS and related chronic pain issues.

Key Facts:

High Diagnostic Accuracy: The AI system detected CRPS through gut microbiome analysis with more than 90% accuracy across different nations.
Persistent Microbiome Signature: Past CRPS sufferers maintained gut microbiome patterns associated with the syndrome.
Potential Susceptibility Marker: The findings suggest that particular microbiome characteristics might predispose certain individuals to develop CRPS.

Source: McGill University

Researchers from McGill University, working alongside teams from Israel and Ireland, have created AI technology capable of recognizing patterns in gut bacteria, effectively identifying CRPS with impressive accuracy. This advancement might revolutionize how CRPS is diagnosed and treated.

CRPS, which affects an estimated 400,000 to 2.1 million individuals globally, often arises in a limb following injury or surgery and can result in enduring disability. It manifests as severe, continual pain—frequently surpassing the initial injury’s discomfort—accompanied by swelling and alterations in skin color and temperature.

“Treating CRPS remains difficult, with many patients suffering for long periods before receiving proper treatment,” remarked Dr. Amir Minerbi, a senior author and Director of the Institute for Pain Medicine at Rambam Health Campus in Haifa, Israel.

A ‘Microbiome Signature’ of CRPS

The study, published in the journal Anesthesiology, utilized advanced machine learning techniques to analyze gut microbiome samples from two distinct groups—one in Israel and another in Canada.

“What’s truly remarkable is that we trained our algorithms on high-quality data from Israeli patients and accurately predicted CRPS in Canadian individuals with over 90% accuracy,” noted Emmanuel Gonzalez, the lead author and a member of the McGill Centre for Microbiome Research.

“This is extraordinary since geographic location, climate, dietary habits, and individual variations usually lead to significant differences in microbiome composition. Yet, our AI approach seems to have found a common microbiome signature for CRPS that could be applicable across different populations.”

The research unveiled notable differences between the gut bacteria of CRPS patients and those without pain.

Findings Suggest Some Might Be Prone to CRPS

Surprisingly, the researchers discovered that even participants whose symptoms had completely subsided following limb amputation retained the same gut microbiome pattern linked to CRPS.

“This enduring signature implies that the gut microbiome could make certain individuals more liable to develop CRPS, with an injury or incident triggering the condition,” explained Dr. Yoram Shir, a Professor at McGill’s Faculty of Medicine.

The findings stemmed from analyses of 120 microbiome and over 100 plasma samples, marking it as one of the largest studies examining the gut microbiome’s relation to chronic pain conditions.

Funding: Support for the study came from several sources, including the Rambam Health Care Campus and the Alan Edwards Pain Management Unit.

About this Research

Abstract: The study focused on CRPS, a chronic pain syndrome typically affecting limbs, characterized by intense pain and various autonomic symptoms. While there’s been some insight into the physiological changes associated with the syndrome, effective treatments remain sparse. This research aimed to uncover the role of the gut microbiome in CRPS, revealing significant variations in microbiome composition that may aid future diagnostic and treatment approaches.