Irritable Bowel Syndrome

Irritable bowel syndrome is a common condition that affects the digestive system. It is described as a functional disorder, which means the gut is not working normally even though tests do not show any visible signs of damage or disease in the bowel.

IBS is usually a long-term condition that can come and go over many years. Symptoms vary from person to person and can range from mild to severe enough to affect daily life, but the condition does not damage the bowel or shorten life expectancy.

IBS is often confused with inflammatory bowel disease (IBD), but they are different conditions. IBD, which includes Crohn's disease and ulcerative colitis, involves inflammation and visible damage to the bowel that can be seen on tests. IBS does not cause this kind of damage.

Because some symptoms overlap, doctors take warning signs seriously and may arrange tests to rule out IBD and other conditions. Understanding the difference is important, as the two are managed differently.

Typical symptoms include abdominal pain or cramping, often relieved by going to the toilet, bloating, and a change in bowel habit. This can mean diarrhoea, constipation, or alternating between the two. Many people also notice mucus in their stool or a feeling that the bowel has not fully emptied.

Symptoms tend to come and go, and may be worse at certain times. Some people find that particular foods, stress, or their menstrual cycle make symptoms worse.

The exact cause of IBS is not fully understood. It is thought to involve a combination of factors, including increased sensitivity of the gut, changes in how the gut muscles move food through, and the close connection between the gut and the brain. Stress and a previous gut infection may play a role for some people.

Common triggers include certain foods and drinks, periods of stress or anxiety, and hormonal changes. Triggers vary from person to person, so identifying your own can be a helpful part of managing the condition.

There is no single test for IBS. Doctors usually make the diagnosis based on the typical pattern of symptoms, after checking that there are no warning signs that point to another condition. They will ask in detail about your symptoms and how long you have had them.

Tests such as blood tests or a stool sample may be done to rule out other causes, including coeliac disease and inflammatory bowel disease. Further tests are usually only needed if there are warning signs or if the picture is unclear.

Management is tailored to your symptoms. Changes to diet often help, such as eating regular meals, adjusting fibre intake, and limiting foods that seem to trigger symptoms. Some people benefit from a structured approach to diet, such as a low-FODMAP plan, which is best followed with guidance from a dietitian.

Stress and the gut are closely linked, so relaxation techniques, regular activity, and sometimes psychological therapies can help. Medicines may be used to ease specific symptoms such as cramps, constipation, or diarrhoea. Because IBS varies, finding the right combination can take some trial and adjustment.

See a doctor if you have ongoing gut symptoms so the diagnosis can be confirmed and other conditions ruled out. It is especially important to seek advice if symptoms are new in later life or are changing.

Certain warning signs need prompt assessment: unexplained weight loss, bleeding from the back passage or blood in the stool, a noticeable lump in the abdomen, difficulty swallowing, or symptoms that wake you at night. These are not typical of IBS and should always be checked.

IBS cannot usually be prevented, but for many people symptoms can be well controlled once triggers are identified and a management plan is in place. Keeping a symptom and food diary can help you and your doctor work out what helps.

The outlook is reassuring in one important way: although IBS can be uncomfortable and frustrating, it does not damage the bowel or lead to more serious bowel disease. Many people find their symptoms improve with the right combination of diet, lifestyle, and treatment.