Irritable Bowel Syndrome and Gut Health
Chronic bloating. Abdominal pain that comes and goes. Diarrhoea after stressful situations. Constipation that alternates with loose stools. And through all of it — perfectly normal test results. If this sounds familiar, you're not alone: irritable bowel syndrome (IBS) affects around 10–15% of people worldwide. This article explains what IBS is, how to distinguish it from other GI conditions, why stress plays a central role, and when it's time to see a gastroenterologist.
What IBS is and why people rarely talk about it
IBS is a functional disorder. This means the bowel isn't working properly, but there are no structural or inflammatory changes: colonoscopy, biopsy, blood tests — all come back normal. This is precisely why people with IBS are often passed from doctor to doctor before anyone arrives at the right diagnosis.
IBS affects 10–15% of adults worldwide. Yet fewer than a third of those affected seek help — many simply learn to live with the discomfort or come to see it as normal.
The official diagnosis is made using Rome IV criteria:
- abdominal pain at least once per week over the past three months;
- pain is associated with defecation (worsens or improves after a bowel movement);
- pain is linked to a change in stool frequency or form.
There are three main subtypes: IBS with predominant diarrhoea (IBS-D), IBS with predominant constipation (IBS-C), and the mixed type (IBS-M).
IBS symptoms: how to tell it apart from other GI conditions
The challenge is that IBS symptoms overlap with those of coeliac disease, inflammatory bowel disease (Crohn's disease, ulcerative colitis), lactose intolerance, and several other conditions. This is why IBS is a diagnosis of exclusion: organic pathology must be ruled out first.
Typical IBS symptoms:
- abdominal pain or discomfort, often crampy;
- bloating and a feeling of fullness;
- alternating diarrhoea and constipation;
- sensation of incomplete bowel emptying;
- mucus in stools (without blood);
- symptoms worsen with stress and improve after a bowel movement;
- typically, they don't disrupt sleep (nighttime symptoms in organic disease are a warning sign).
Red flags that suggest something other than IBS and require further investigation:
- blood in stools;
- unintentional weight loss;
- symptoms that began after age 50;
- pain that wakes you at night;
- fever;
- family history of colorectal cancer or inflammatory bowel disease.
IBS and stress: why the connection is stronger than it seems
The gut is called the "second brain" — and not just as a metaphor. The enteric nervous system of the gut contains around 500 million neurons and is directly connected to the brain via the vagus nerve and the gut-brain axis.
Under stress, the brain sends signals to the gut, speeding it up or slowing it down. In people with IBS, this connection is hypersensitive: the gut's nervous system reads normal stimuli (wall stretching, peristalsis) as painful. This is why a stressful exam, a workplace conflict, or an emotional conversation immediately shows up as abdominal symptoms.
This same link explains why psychotherapy and antidepressants often work better for IBS than conventional GI medications. Clinical trials have demonstrated the effectiveness of cognitive behavioural therapy (CBT), gut-directed hypnotherapy, and stress management programmes in treating IBS.
Diet and gut health
Diet is a key tool for managing IBS symptoms. There is no universal diet, but certain evidence-based approaches stand out.
Low-FODMAP diet. FODMAPs are fermentable carbohydrates (oligosaccharides, disaccharides, monosaccharides, and polyols) that are poorly absorbed in the small intestine and cause significant gas production. They include: lactose, fructose, fructans (wheat, onion, garlic), sorbitol (some fruits), and others. Research shows a low-FODMAP diet reduces symptoms in 50–75% of people with IBS.
The approach: eliminate all high-FODMAP foods for 4–8 weeks, then reintroduce them one at a time to identify personal triggers. This diet is best undertaken with a dietitian because it is complex.
Other helpful principles for eating with IBS:
- eat slowly and chew thoroughly;
- don't skip meals — irregular eating triggers spasms;
- limit coffee, alcohol, and fizzy drinks;
- for IBS-C — increase fibre and fluid; for IBS-D — approach high-fibre foods cautiously;
- keep a food and symptom diary to identify personal triggers.
Probiotics. Certain strains (Lactobacillus, Bifidobacterium) have shown moderate benefit in reducing bloating and improving stool consistency. The effect is individual — try a 2–4 week course and assess the outcome.
When it's no longer IBS and you need a gastroenterologist
It's important to understand: IBS is not a reason to skip investigation. The diagnosis is only made after more serious conditions are excluded. You must see a doctor if:
- any of the red flags listed above are present;
- symptoms are new and severe;
- symptoms have changed in character or are worsening;
- you are over 50 and have never had a colonoscopy;
- your quality of life is significantly affected — work, relationships, or sleep are disrupted.
For IBS, a doctor will order basic tests (CBC, stool for occult blood, faecal calprotectin, coeliac antibodies if suspected), and a colonoscopy if indicated. Treatment is tailored individually.
Not sure whether you need a gastroenterologist or a GP? Try describing your symptoms to the assistant — or use the doctor routing tool.
Frequently asked questions
Is IBS serious? Can it lead to cancer?
IBS is not a cancerous or inflammatory condition — it doesn't increase the risk of bowel cancer and doesn't progress to Crohn's disease or ulcerative colitis. It is a functional disorder. That said, it significantly reduces quality of life, which is precisely why it deserves treatment.
What is faecal calprotectin and why test for it?
Calprotectin is a protein released during bowel inflammation. It is normal in IBS; it is elevated in inflammatory bowel disease (Crohn's disease, ulcerative colitis). A stool calprotectin test helps distinguish functional disorders from organic ones without needing a colonoscopy.
Can IBS be fully cured?
Complete "cure" is not achievable in most cases, but long-term remission is genuinely possible. A combination of dietary changes, stress management, medication when needed, and psychotherapy allows many people to live with minimal or no symptoms.
Does cutting out gluten help with IBS?
Some people with IBS feel better on a gluten-free diet — even without coeliac disease. This is called non-coeliac gluten sensitivity. Before cutting gluten, get tested for coeliac disease while still eating it — after elimination, results will be falsely negative.
Why are IBS symptoms worse before a period?
Hormonal fluctuations — particularly progesterone and prostaglandins — directly affect gut motility. Many women with IBS find symptoms worsen during the luteal phase and menstruation. This is a recognised pattern, not a sign of a new condition.
Symptomatica is an informational reference service. Not a medical service; does not diagnose or prescribe treatment. For any symptoms, please consult a doctor.