IBS — understanding triggers and treatment
Reviewed by the My London Pharmacy clinical team, Michelle Chuku, Pharmacist Independent Prescriber
·29 July 2026
·7 min read
Quick answer
Irritable bowel syndrome (IBS) is a common condition affecting how the gut works, causing tummy pain, bloating and changes in bowel habit. There is no single treatment; care combines identifying triggers, diet and lifestyle changes, and targeted medicines to ease specific symptoms, guided by a clinician.
What IBS is
Irritable bowel syndrome is a common, long-term condition that affects the way the digestive system functions. Unlike some gut conditions, it does not damage the bowel or lead to more serious disease, but it can cause genuinely troublesome symptoms that come and go over months and years. Typical features include abdominal pain or cramping, bloating, wind, and changes in bowel habit that may lean towards constipation, diarrhoea, or an alternating mix of both. Many people also notice that symptoms ease after opening their bowels.
The exact cause is not fully understood, but it is thought to involve the gut being more sensitive than usual and the muscles of the bowel contracting differently, so that food passes through too quickly or too slowly. The close communication between the gut and the brain, sometimes called the gut-brain axis, plays an important role, which is why stress and mood can influence symptoms. Previous gut infections, changes in the gut's bacteria, and diet can also contribute. Because IBS varies so much between people, and because symptoms overlap with other conditions, treatment is tailored to the individual rather than following a single fixed formula.
Understanding your triggers
Many people with IBS find that certain foods or situations tend to set off their symptoms. Identifying your own pattern is one of the most useful steps you can take, and a symptom and food diary kept over a few weeks often reveals connections that are easy to miss day to day. Noting what you ate, how stressed you felt and how your symptoms behaved can help you and your clinician see what matters most for you.
- Common dietary triggers include caffeine, alcohol, fatty or spicy foods, and fizzy drinks.
- Some people react to foods high in certain fermentable carbohydrates, known as FODMAPs, found in some fruits, vegetables, pulses and wheat.
- Irregular meals, skipping breakfast, eating quickly and not drinking enough fluid can contribute.
- Stress, anxiety and poor sleep frequently make symptoms worse, reflecting the strong gut-brain link.
- For some, hormonal changes around the menstrual cycle affect symptoms.
Recognising triggers does not mean cutting out large food groups permanently, which can do more harm than good without guidance and may leave your diet unbalanced.
Diet and lifestyle approaches
UK guidance from NICE places first-line emphasis on diet and lifestyle, and for many people these changes make a real difference. Regular meals, taking time to eat, staying well hydrated, moderating caffeine and alcohol, and adjusting fibre to suit your symptoms are sensible starting points. For constipation-predominant IBS, gradually increasing soluble fibre, found in oats and linseeds, may help, while some people with diarrhoea find reducing insoluble fibre such as bran useful.
A more structured approach, such as a low-FODMAP diet, can help some people whose symptoms have not settled with simpler measures, but it is best done with support from a dietitian so it stays nutritionally balanced and foods are reintroduced properly rather than avoided indefinitely. Beyond diet, regular physical activity, managing stress through relaxation or talking therapies, and protecting your sleep all support symptom control. These reflect how closely the gut and nervous system interact, and addressing them together often works better than focusing on food alone.
Medication options for symptoms
When diet and lifestyle changes are not enough, medicines can target specific symptoms, and a clinician can advise what may be suitable for you based on your main problem. Antispasmodics are often used to ease cramping pain by relaxing the muscle in the gut wall; Alverine Citrate is one example that may be considered for suitable people. For flares, treatments are matched to whether constipation or diarrhoea predominates, so an antidiarrhoeal, a laxative or another option might be suggested depending on your pattern.
In certain cases of IBS with diarrhoea that has not responded to other measures, a clinician may consider a short, specific course of Rifaximin (Xifaxanta), a gut-focused antibiotic used for this purpose. Some people also benefit from peppermint oil for cramping, or, under clinical guidance, low-dose medicines that act on the gut-brain pathway to reduce pain sensitivity. Because IBS treatment is individual and symptoms overlap with other conditions, medicines should be used on clinical advice rather than assumed, and reviewed to check they are genuinely helping before being continued.
Living well with IBS
IBS can be frustrating because it fluctuates, but most people find that with the right combination of measures they can manage it well and get on with daily life. It often helps to think of your plan as personal and adjustable rather than fixed, refining it as you learn what settles your gut and what stirs it up. Small routines, such as eating at regular times and building in ways to unwind, can make symptoms more predictable.
Because the gut-brain link is so central, looking after your mental wellbeing is a genuine part of managing IBS, not an afterthought. Stress-management techniques, regular activity and, for some people, talking therapies can reduce both the frequency and the impact of symptoms. It can also help to plan ahead for situations that worry you, such as travel or eating out, so that IBS feels less limiting. If symptoms change or worsen, a review lets you and your clinician adjust the plan together.
It can also be reassuring to know that IBS is very common and is a recognised medical condition, not something imagined or brought on by weakness. Being believed and taken seriously is an important part of managing it well, and a supportive relationship with your clinician or pharmacy team can make a real difference to how you cope. Over time, most people build up a personal toolkit of foods, routines and strategies that work for them, and lean on the ones that help most when symptoms flare, which brings a welcome sense of being back in control.
When to seek clinical help
IBS is common, but some symptoms need proper assessment to rule out other conditions. See a clinician promptly if you notice bleeding from the bottom, unexplained weight loss, a persistent change in bowel habit especially if you are older, a lump in your tummy, difficulty swallowing, or symptoms that repeatedly wake you at night. These are not typical of IBS and deserve a closer look to check nothing else is going on.
It is also worth seeking help if your symptoms are affecting your daily life, are not settling with self-care, or are causing you worry. A clinician can confirm the diagnosis, sometimes after simple tests, suggest a management plan tailored to your symptoms, and review your progress so treatment can be adjusted over time. Asking for help is sensible rather than something to put off, and getting the right support early often makes IBS much easier to live with.
A pharmacist can be a helpful first point of contact for many IBS symptoms, offering advice on diet, over-the-counter options and self-care, and letting you know when it would be worth arranging a consultation. Because IBS is long-term and tends to fluctuate, your needs may change over time, and it is perfectly reasonable to come back for further advice as they do. With a considered, individual approach that combines understanding your triggers, sensible diet and lifestyle changes, and targeted treatment where needed, most people find their symptoms become far more manageable. The aim throughout is to help you feel more in control of your gut and more confident going about daily life, rather than planning your day around your symptoms, and support is there whenever you need it along the way.
Frequently asked questions
What causes IBS?
The exact cause is unclear, but IBS is linked to a more sensitive gut, altered bowel muscle activity, the gut-brain connection, stress and diet. It does not damage the bowel.
Can changing my diet really help IBS?
For many people, yes. Regular meals, hydration, moderating caffeine and alcohol, and adjusting fibre help. A structured low-FODMAP approach can help some people but is best done with dietitian support.
Are there medicines for IBS?
Yes, targeted at specific symptoms. Antispasmodics such as Alverine Citrate can ease cramping, and other treatments address constipation or diarrhoea. A clinician can advise what suits you.
Is IBS linked to stress?
Stress does not cause IBS on its own, but it frequently worsens symptoms because of the close link between the gut and the nervous system. Managing stress can improve control.
Does IBS increase the risk of other bowel disease?
IBS itself does not damage the bowel or lead to more serious disease. However, some warning symptoms need checking to rule out other conditions, so it is important to see a clinician about them.
When should I see a clinician?
Seek prompt advice for bleeding, unexplained weight loss, a persistent change in bowel habit, a tummy lump, or night-time symptoms, as these are not typical of IBS.