An easy-to-understand guide to an emerging area of research connecting the gut microbiome, immune signalling, the nervous system and musculoskeletal health.

Back pain is usually discussed in terms of muscles, joints, discs, nerves, movement and load. Those factors remain central. Yet the spine does not live in isolation: it shares the body with the immune system, circulation, metabolism, nervous system and trillions of microorganisms in the digestive tract.

Researchers are now asking whether those systems exchange signals that can influence spinal tissues or the way pain is experienced. This developing idea is often called the gut–spine axis. It is scientifically intriguing, but it is not a diagnosis, and it does not mean that back pain begins in the gut.

 

First, What Is the Gut Microbiome?

The gut microbiome is the community of bacteria, archaea, fungi, viruses and other microorganisms living throughout the digestive tract. These organisms interact with food, the intestinal lining and the immune system. Their collective genes and metabolic activity extend what the human digestive system can do.

Gut microbes help ferment dietary components that human enzymes cannot fully digest. In doing so, they produce metabolites—including short-chain fatty acids—that can interact with intestinal cells, immune pathways and distant organs. The microbiome is shaped by diet, age, medication exposure, illness, sleep, stress, activity, geography and many other influences.

Gut Health Is Not Just About Probiotics: Why Feeding Your Microbiome Matters explains why the foods that reach gut microbes matter as much as adding particular microorganisms.

The Body Is Organised, but Not Isolated

The word “axis” can make the connection sound like a single cable running from one organ to another. Biology is messier and more interesting. It is closer to a group conversation: immune messengers, microbial metabolites, hormones, nerves and circulation carry information in several directions at once.

 

 

From the Gut–Brain Axis to the Gut–Spine Question

The gut–brain axis is the better-established umbrella concept. It describes bidirectional communication involving the vagus nerve and other neural pathways, immune signals, hormones, stress physiology and microbial metabolites. Because the brain and spinal cord form the central nervous system, researchers are extending this systems view to pain and spinal health.

The Gut-Brain Axis Explained provides the foundation for understanding this wider communication network.

A 2023 narrative review proposed the term “gut–spine axis” while examining possible links between the microbiome and spinal structures including bone, cartilage, intervertebral discs, ligaments and muscle. A narrative review can connect ideas and generate hypotheses, but it does not establish that changing the microbiome will prevent or treat spinal degeneration.

Inflammation Is One Possible Bridge

Inflammation is not automatically harmful. It is part of normal defence, repair and adaptation. After an injury, immune activity helps clear damaged material and coordinate rebuilding. The question is what happens when inflammatory signalling becomes prolonged, poorly regulated or part of a wider metabolic disturbance.

Researchers are studying whether intestinal barrier changes, microbial products and altered metabolites can influence systemic immune activity. In theory, that environment could affect pain sensitivity or tissues far beyond the gut. The size, direction and clinical importance of these effects in humans remain uncertain.

Inflammation Explained: Understanding the Body's Natural Response to Injury, Infection & Repair separates useful acute inflammation from longer-term dysregulation.

Pain Is More Than a Damage Meter

Pain is real, but it is not a simple readout of tissue damage. The nervous system combines incoming signals with inflammation, previous experience, sleep, stress, attention, mood, safety and context. This is why two people with similar imaging findings can feel very different—and why pain can persist after an injury has healed.

This does not mean pain is “in the head”. It means pain is a protective experience produced by a living nervous system. Microbiome research enters this picture because microbial and immune signals may be among the many inputs that influence sensitisation. They are unlikely to be the entire explanation.

What Chronic-Pain Research Has Found

A 2024 systematic review and meta-analysis compared gut microbiome findings in people with chronic pain and control groups. It reported indications of altered microbial composition and lower values for some diversity measures in chronic-pain groups. Results for other measures were inconsistent, and the included conditions and study methods varied.

These limitations matter. Microbiome studies can be affected by diet, medications, geography, bowel habits, activity, body composition and sequencing methods. A microbial pattern observed in a group is not yet a diagnostic test for an individual, nor does it show which change came first.

 

Fibromyalgia and the Microbiome

Fibromyalgia is characterised by widespread pain and commonly includes fatigue, sleep disturbance and cognitive symptoms. In a 2019 observational study, researchers from McGill University and collaborating institutions found differences in the abundance of several bacterial species in women with fibromyalgia compared with control participants. Some microbial patterns were associated with symptom measures.

Machine-learning models could distinguish study participants using microbiome information, but that does not make the microbiome a validated clinical diagnostic test. The study could not determine whether the microbial differences contributed to fibromyalgia, resulted from the condition or reflected associated factors such as diet, medication, activity or sleep.

Later research has continued to explore possible causal and treatment pathways, but clinical evidence remains preliminary. People living with fibromyalgia should not replace evidence-based care with restrictive diets, unvalidated microbiome tests or self-directed microbiome treatments.

Can Digestive Problems Feel Like Back Pain?

Digestive symptoms and back discomfort can occur together for several reasons that do not require a gut–spine microbiome mechanism. Abdominal or pelvic discomfort can sometimes be felt in nearby regions through referred pain. Constipation may be accompanied by abdominal pressure and lower back discomfort. Pain can also reduce movement, alter appetite and disrupt bowel routines.

Kidney, urinary, reproductive and gastrointestinal conditions can also cause pain felt in the back or flank. New, severe, recurrent or unexplained pain needs appropriate assessment rather than being assumed to come from “leaky gut” or dysbiosis.

 

What Food Can—and Cannot—Do

No food has been shown to repair a disc, reverse fibromyalgia or treat chronic back pain through the microbiome. Food still matters because it supplies energy and building blocks, supports muscle and bone, shapes bowel function and provides substrates for gut microbes. The most credible approach is a varied eating pattern rather than a “gut reset”.

A Food-First Pattern

· Vegetables and fruit in varied colours and forms.

· Legumes such as lentils, chickpeas and beans.

· Whole grains where suitable and tolerated.

· Nuts, seeds and extra-virgin olive oil.

· Fish and other varied protein foods.

· Fermented foods where enjoyed and appropriate.

· Water and other nourishing fluids.

The Mediterranean Diet: What Makes It One of the World's Most Studied Eating Patterns? explains why this pattern is studied as a whole rather than reduced to one ingredient.

Fibre and Resistant Starch

Fibre-rich foods provide different structures that influence stool bulk, transit and microbial fermentation. Resistant starch is found in foods such as legumes and in some cooked-and-cooled potato, rice and pasta. It reaches the large intestine in a form that can be fermented by microbes. Increase fibre gradually if intake has been low and drink enough fluid.

Protein and Musculoskeletal Support

Protein provides amino acids for the continual maintenance of muscle and other tissues. It also helps meals feel substantial. Fish, eggs, poultry, lean meat, dairy foods, tofu, legumes, nuts and seeds can all contribute, depending on preferences and dietary needs.

High-Protein Foods: The Foundation of Muscle, Healthy Ageing & Recovery Nutrition offers practical ways to spread protein across meals.

Where Bone Broth Fits

Bone broth is a savoury whole-food ingredient that can sit within this broader pattern. Broth & Co bone broth supplies naturally occurring protein and collagen-associated amino acids and can be used as a warm drink or as a base for soups, legumes, grains, sauces and slow-cooked meals.

Its most useful role here is practical: it can make nourishing meals easier to prepare and enjoy. Bone broth should not be presented as a treatment for back pain, spinal degeneration, fibromyalgia or inflammation.

Bone Broth Benefits: The Complete Guide to Gut Health, Protein, Recovery & Healthy Ageing explains its nutrition in context. Functional Proteins Explained: Why Whey, Collagen & Bone Broth All Have Different Roles compares its role with other protein foods.

What the Broth & Co Digestive Study Adds

A Broth & Co bone broth powder was evaluated in Australian adults reporting lower gastrointestinal disturbances. Participant-reported digestive outcomes and measures associated with intestinal permeability were investigated during daily use. The study is relevant to digestive wellbeing, but it did not test back pain, fibromyalgia or the gut–spine axis and should not be used to imply those outcomes.

Bone Broth Clinical Study: Digestive Wellbeing & Intestinal Permeability Research | Broth & Co provides the study design, results and limitations.

For a practical meal, explore Mediterranean Bone Broth Recipes.

The Wider Recovery Picture

The gut is one part of a much larger network. Movement, sleep, stress, hydration, smoking, alcohol, medication, healthcare, social context and existing conditions can all influence digestive wellbeing, pain and recovery.

 

Why Your Body Is Built to Move: The Science Behind Strength, Recovery & Everyday Movement explores movement as a biological signal. Recovery Isn't Just for Athletes: Why Your Body Repairs Itself Every Day explains everyday repair, while Functional Hydration places fluids in a whole-body context.

A Simple Daily Framework

Morning

· Begin with water and a breakfast containing protein and a fibre-rich food where practical.

· Use daylight and comfortable movement to establish an active day.

· Notice symptoms without turning one meal or one bowel movement into a verdict on gut health.

During the Day

· Build meals from varied whole foods rather than chasing a single anti-inflammatory ingredient.

· Break up long sitting periods with movement that suits your capacity.

· Increase fibre gradually and pair it with adequate fluid.

Evening

· Choose a satisfying meal with vegetables, a protein food, healthy fats and carbohydrate according to appetite and needs.

· Use a soup or broth-based meal when warmth and convenience make eating easier.

· Protect a consistent wind-down routine and enough time for sleep.

Frequently Asked Questions

What is the gut–spine axis?

It is an emerging research framework exploring how gut microbes, immune and metabolic signals, the nervous system and spinal tissues may interact.

Can poor gut health cause back pain?

Current research does not establish poor gut health as a direct cause of back pain. Back pain has many possible contributors and persistent or concerning symptoms need appropriate assessment.

Does constipation cause lower back pain?

Constipation can occur with abdominal pressure or back discomfort, but back pain can have many other causes. Seek advice when symptoms are severe, recurrent or unexplained.

Is fibromyalgia caused by gut bacteria?

No. Studies have found microbiome differences in groups with fibromyalgia, but they have not established that gut bacteria are the sole cause.

Should I take probiotics for back pain?

There is not enough evidence to recommend probiotics as a treatment for back pain. Different products contain different strains and doses, and benefits cannot be generalised.

What foods support the gut microbiome?

A varied pattern containing vegetables, fruit, legumes, whole grains where suitable, nuts, seeds and other minimally processed foods provides diverse substrates for gut microbes.

Is bone broth a treatment for gut or back pain?

No. Bone broth is a food that supplies protein and collagen-associated amino acids. It can form part of a varied diet but should not replace diagnosis or treatment.

Can diet replace movement or physiotherapy?

No. Nutrition and movement have different roles. A clinician or physiotherapist can help tailor activity and treatment to the cause and severity of pain.

References and Further Reading

· Gut–spine axis: a possible correlation between gut microbiota and spinal degenerative diseases — review

· Gut dysbiosis in patients with chronic pain — systematic review and meta-analysis

· Altered microbiome composition in individuals with fibromyalgia — observational study

· Gut microbiota-mediated pain sensitisation — review

· Back pain — Healthdirect Australia

Final Thoughts

The most memorable lesson of the gut–spine axis is not that back pain “comes from the gut”. It is that no tissue works alone. The spine is mechanical, neurological, immune, metabolic and responsive to the life of the whole person.

Research may eventually reveal useful microbiome-informed tools for pain and spinal health. For now, the strongest foundation remains less dramatic and more dependable: varied food, appropriate movement, sleep, stress support, hydration and timely healthcare—working together rather than competing for credit.