In One Minute

Irritable Bowel Syndrome (IBS) affects millions of people worldwide.

For some, it causes occasional abdominal discomfort.

For others, it leads to persistent bloating, abdominal pain, diarrhoea, constipation or alternating bowel habits that interfere with daily life.

Because IBS is a chronic condition without a single identifiable cause, many patients begin searching for broader explanations.

This often leads them to explore functional medicine.

Can the gut microbiome explain IBS?

Do food intolerances play a role?

Should everyone have microbiome testing?

Can lifestyle changes improve symptoms?

This guide examines these questions through the perspective of modern, evidence-based medicine while recognising the growing importance of personalised healthcare.

What Is Irritable Bowel Syndrome?

Irritable Bowel Syndrome (IBS) is a functional gastrointestinal disorder, meaning that the digestive system does not function normally despite the absence of structural abnormalities that would explain the symptoms.

Unlike inflammatory bowel diseases such as Crohn's disease or ulcerative colitis, IBS does not cause ongoing inflammation or permanent damage to the intestine.

Nevertheless, its impact on quality of life can be considerable.

Many patients experience symptoms that fluctuate over time, with periods of improvement followed by episodes of increased discomfort.

IBS Is More Common Than Many People Realise

IBS is one of the most frequently encountered conditions in gastroenterology and primary care.

It affects people of all ages and may occur in both men and women.

Although symptoms vary considerably between individuals, common features include:

• Abdominal pain or discomfort.
• Bloating.
• Excessive gas.
• Diarrhoea.
• Constipation.
• Alternating diarrhoea and constipation.
• A feeling of incomplete bowel emptying.

The severity of symptoms also varies.

Some individuals experience only occasional discomfort.

Others find that IBS significantly affects work, travel, social activities and overall quality of life.

Why Does IBS Develop?

One of the reasons IBS remains challenging to understand is that there is no single cause.

Instead, current research suggests that several factors may contribute.

These include:

• Altered communication between the brain and the digestive system.
• Changes in intestinal motility.
• Increased sensitivity of the digestive tract.
• Previous gastrointestinal infections.
• Dietary factors.
• Psychological stress.
• Alterations in the gut microbiome.

Different patients may experience different combinations of these factors.

This helps explain why no single treatment is effective for everyone.

Why Many Patients Explore Functional Medicine

Living with persistent digestive symptoms can be frustrating.

Some people have undergone multiple investigations.

Others have been reassured that no serious disease is present, yet their symptoms continue.

Many patients simply want to understand why they feel the way they do.

Functional medicine has become increasingly popular because it encourages physicians to look beyond the diagnosis alone.

It often explores questions relating to:

• Nutrition.
• Lifestyle.
• Stress.
• Sleep.
• The gut microbiome.
• Digestive function.

These are important aspects of health.

However, they should always be evaluated within the context of careful medical assessment and current scientific evidence.

IBS Is a Diagnosis Based on Clinical Assessment

One of the most common misconceptions is that IBS can only be diagnosed after every possible investigation has been performed.

In reality, modern clinical guidelines recommend a positive diagnosis based on characteristic symptoms, a detailed medical history and the absence of features suggesting a more serious underlying condition.

Additional investigations may be appropriate when symptoms suggest another diagnosis or when so-called "alarm features" are present.

These may include:

• Unexplained weight loss.
• Rectal bleeding.
• Iron deficiency anaemia.
• Persistent fever.
• Nocturnal symptoms that wake a patient from sleep.
• A strong family history of colorectal cancer or inflammatory bowel disease.

Recognising when further investigation is required is one of the most important responsibilities of the physician.

Dr. Indhira Ghyssaert's Approach

Dr. Indhira Ghyssaert believes that every patient with persistent digestive symptoms deserves a careful, individual assessment.

Rather than assuming that all IBS has the same cause, she evaluates each patient's medical history, symptom pattern, nutrition, lifestyle, medication use and overall health before recommending investigations or treatment.

Where lifestyle or dietary factors appear relevant, these are considered alongside current evidence-based medical recommendations.

Where further investigations are clinically indicated, they are selected thoughtfully to answer specific diagnostic questions.

Her goal is not simply to label symptoms.

It is to help patients better understand their digestive health while ensuring that important medical conditions are not overlooked.

Functional Medicine and IBS: Where Do They Overlap?

One reason many patients with IBS become interested in functional medicine is that conventional medical investigations often fail to identify a structural abnormality that explains their symptoms.

Blood tests may be normal.

Endoscopic examinations may be normal.

Medical imaging may also appear normal.

Yet patients continue to experience abdominal pain, bloating and altered bowel habits.

This can understandably be frustrating.

Functional medicine attempts to explore a broader range of factors that may influence digestive health, including nutrition, sleep, stress, lifestyle and the gut microbiome.

Many of these areas are also increasingly recognised within evidence-based gastroenterology.

The important distinction is that recommendations should always be guided by current scientific evidence rather than assumptions.

The Gut Microbiome and IBS

The gut microbiome has become one of the most intensively studied areas of IBS research.

Scientists have observed that some individuals with IBS appear to have differences in the composition and function of their intestinal microbiome compared with healthy individuals.

However, these findings are highly variable.

There is currently no single "IBS microbiome."

Nor has one specific bacterial profile been identified as the cause of IBS.

The relationship appears to be far more complex.

Researchers continue to investigate whether alterations in the microbiome contribute to IBS, result from IBS or represent one of several interacting factors.

Although this field is evolving rapidly, many important questions remain unanswered.

Nutrition Often Plays an Important Role

Many patients notice that certain foods appear to trigger digestive symptoms.

These triggers vary considerably between individuals.

Rather than assuming that every patient should follow the same dietary approach, physicians increasingly recommend personalised nutritional assessment.

Current evidence supports several nutritional strategies for selected patients.

These may include identifying individual food triggers and, where appropriate, dietary interventions supervised by appropriately qualified healthcare professionals.

The objective is not to eliminate as many foods as possible.

It is to develop a nutritionally balanced and sustainable dietary pattern that helps improve symptoms while supporting long-term health.

The Low FODMAP Diet

One of the best-studied dietary approaches for IBS is the low FODMAP diet.

FODMAPs are certain short-chain carbohydrates that may be poorly absorbed by some individuals, leading to symptoms such as bloating, abdominal pain and altered bowel habits.

Clinical studies have shown that a structured low FODMAP diet may improve symptoms in selected patients with IBS.

However, this diet is not intended to be followed indefinitely.

It is usually performed in carefully planned phases that include food reintroduction in order to identify personal triggers while maintaining nutritional adequacy and supporting a healthy gut microbiome.

For this reason, professional guidance is recommended whenever possible.

Stress and the Gut–Brain Axis

IBS illustrates particularly well how closely the digestive system and the nervous system communicate.

Emotional stress does not mean that IBS is "psychological."

Rather, stress can influence intestinal motility, visceral sensitivity and communication along the gut–brain axis.

Likewise, persistent digestive symptoms may themselves contribute to anxiety, frustration or reduced quality of life.

This two-way relationship highlights why effective IBS management often considers both physical and psychological aspects of health.

Understanding the whole person remains just as important as understanding the digestive system.

What About Probiotics?

Patients frequently ask whether probiotics are the answer to IBS.

Current scientific evidence suggests a more balanced conclusion.

Some probiotic strains have shown benefit in selected patients with IBS.

Others have demonstrated little or no effect.

Different probiotic strains should not be considered interchangeable.

Results observed in one clinical study cannot automatically be applied to every product available commercially.

For this reason, probiotic recommendations should always be individualised and based on current clinical evidence.

There is currently no universal probiotic suitable for every patient with IBS.

Personalised Care Is Essential

Perhaps the greatest lesson from IBS research is that no two patients are exactly alike.

Symptoms vary.

Triggers vary.

Responses to treatment vary.

Lifestyle differs.

Medical history differs.

This is one reason why physician-led care remains so valuable.

Rather than applying identical recommendations to every patient, physicians combine clinical assessment, scientific evidence and individual circumstances to develop an appropriate management plan.

Dr. Indhira Ghyssaert's Approach

Dr. Indhira Ghyssaert believes that IBS should never be approached with a standard protocol or a predefined list of supplements.

Her consultations begin with understanding the patient's symptoms, medical history, nutrition, lifestyle and overall health.

Where dietary changes may be appropriate, these are discussed within the context of evidence-based medicine and the patient's individual nutritional needs.

Where additional investigations are indicated, they are selected because they address meaningful clinical questions rather than following a routine testing strategy.

For Dr. Ghyssaert, the goal is not simply to reduce digestive symptoms.

It is to help patients better understand their digestive health while supporting long-term wellbeing through thoughtful, personalised medical care.

IBS Is Complex—And That Is Why Personalised Care Matters

One of the greatest frustrations for people living with Irritable Bowel Syndrome is that there is rarely a single explanation for their symptoms.

IBS is not caused by one bacterium.

One food.

One vitamin deficiency.

Or one hidden disease.

Current research suggests that IBS develops through a complex interaction between the digestive system, the nervous system, the gut microbiome, genetics, previous infections, nutrition and lifestyle.

The relative importance of these factors differs from one individual to another.

This complexity explains why successful management often requires an individualised rather than standardised approach.

There is no universal treatment that works for everyone.

Good medicine recognises this reality.

Living Well with IBS

Although IBS is often a long-term condition, many people experience significant improvement over time.

The goal of medical care is not only to reduce symptoms.

It is also to improve quality of life.

For some patients, this may involve dietary modification.

For others, stress management.

Some benefit from medication.

Others from increasing physical activity or improving sleep quality.

Many require a combination of approaches.

Helping patients understand their condition, identify individual triggers and develop realistic long-term strategies is one of the most valuable aspects of physician-led care.

Frequently Asked Questions

Can functional medicine cure IBS?

There is currently no scientific evidence that functional medicine can universally cure IBS.

However, many principles commonly associated with functional medicine—including nutritional assessment, lifestyle optimisation and personalised care—may contribute to symptom management when integrated into evidence-based medical practice.

Treatment should always be tailored to the individual patient.

Is IBS caused by poor gut health?

Not necessarily.

The gut microbiome may play a role in IBS for some individuals, but IBS is a multifactorial condition.

Altered gut–brain communication, intestinal sensitivity, diet, previous infections, psychological stress and other biological factors may also contribute.

Should everyone with IBS avoid the same foods?

No.

Food triggers vary considerably between individuals.

Rather than following unnecessary long-term dietary restrictions, physicians increasingly recommend identifying personal triggers while maintaining a balanced and nutritionally adequate diet.

Can stress make IBS worse?

Yes.

Stress does not cause IBS by itself, but it may influence digestive symptoms through the gut–brain axis.

Likewise, persistent digestive symptoms may increase emotional stress.

This two-way relationship helps explain why a comprehensive approach to care is often beneficial.

When should IBS symptoms be investigated further?

Symptoms such as unexplained weight loss, blood in the stool, persistent fever, iron deficiency anaemia, significant nocturnal symptoms or a strong family history of colorectal cancer or inflammatory bowel disease require prompt medical assessment.

These features are not typical of uncomplicated IBS and may indicate another condition requiring further investigation.

Common Misconceptions

Myth

"IBS is all in your head."

Reality

IBS is a recognised medical disorder involving altered communication between the digestive system and the nervous system. Although stress may influence symptoms, IBS is not an imaginary illness.

Myth

"There is one diet that cures IBS."

Reality

No single diet is effective for everyone.

Dietary management should always be personalised according to symptoms, nutritional requirements and current scientific evidence.

Myth

"If my tests are normal, nothing is wrong."

Reality

IBS is diagnosed using recognised clinical criteria after appropriate medical assessment.

Normal investigations do not mean that symptoms are not genuine.

Myth

"Everyone with IBS needs supplements or probiotics."

Reality

Some patients may benefit from selected interventions, but there is currently no universal supplement or probiotic that has been shown to improve IBS in every individual.

Recommendations should always be evidence-based and personalised.

Key Takeaways

• IBS is one of the most common gastrointestinal disorders worldwide.
• It is a real medical condition that can significantly affect quality of life.
• IBS develops through multiple interacting biological, neurological and lifestyle factors.
• Functional medicine highlights the importance of nutrition, lifestyle and personalised care, but these approaches should always remain grounded in scientific evidence.
• Long-term symptom management is most effective when treatment is individualised and guided by careful clinical assessment.

Dr. Indhira Ghyssaert's Philosophy

Dr. Indhira Ghyssaert believes that caring for patients with IBS requires curiosity, patience and careful clinical judgement.

Rather than focusing on one possible explanation, she considers the broader picture.

Medical history.

Digestive symptoms.

Nutrition.

Lifestyle.

Sleep.

Stress.

Previous investigations.

Overall health.

Every recommendation is based on thoughtful assessment and the best available scientific evidence.

Where dietary or lifestyle modifications may provide benefit, these are adapted to the individual's circumstances rather than following rigid protocols.

For Dr. Ghyssaert, effective IBS care is not about chasing trends or promising quick solutions.

It is about understanding the patient, explaining the condition clearly and building a practical, sustainable plan that supports both digestive health and overall wellbeing.

About Dr. Indhira Ghyssaert

Dr. Indhira Ghyssaert is a licensed General Practitioner providing physician-led private medical consultations in Mallorca.

She has a particular interest in preventive medicine, personalised healthcare, lifestyle medicine, nutrition and digestive health.

Her consultations combine evidence-based medicine with careful listening and comprehensive clinical assessment, helping international residents, second-home owners and visitors better understand complex digestive symptoms while supporting informed medical decisions.

Medical Disclaimer

This guide is intended for educational purposes only and should not replace an individual medical consultation.

Persistent digestive symptoms should always be assessed by a qualified physician to establish an accurate diagnosis and exclude other medical conditions where appropriate.

Medical recommendations should be individualised and based on current scientific evidence, professional clinical judgement and each patient's specific medical circumstances.

Related Articles

Continue exploring our Physician's Guide to Functional Medicine and Digestive Health:

• Functional Medicine and Gut Health
• Can Functional Medicine Help Chronic Fatigue?
• Functional Medicine and Inflammation
• Functional Medicine and Autoimmune Diseases
• Functional Medicine and Thyroid Disorders
• Personalised Medicine in Mallorca
• Lifestyle Medicine Explained
• Preventive Medicine in Mallorca

Request a Consultation

If you are experiencing persistent digestive symptoms or have been diagnosed with IBS, you may request a consultation with Dr. Indhira Ghyssaert.

Following a comprehensive physician-led assessment, she will recommend an individualised management plan based on your medical history, symptom pattern, nutritional status and the best available scientific evidence.

The aim is always the same:

To understand your symptoms, identify meaningful contributing factors and help you achieve better digestive health through personalised, evidence-based medical care.

Scientific References

1. American College of Gastroenterology (ACG). Clinical Guideline: Management of Irritable Bowel Syndrome.
2. British Society of Gastroenterology (BSG). Guidelines on the Management of Irritable Bowel Syndrome.
3. National Institute for Health and Care Excellence (NICE). Irritable Bowel Syndrome in Adults: Diagnosis and Management.
4. World Gastroenterology Organisation (WGO). Irritable Bowel Syndrome Global Guidelines.
5. American Gastroenterological Association (AGA). Clinical Practice Guidelines on IBS.
6. World Medical Association. International Code of Medical Ethics.
7. Sackett DL, et al. Evidence-Based Medicine: What It Is and What It Isn't. BMJ