Irritable Bowel Syndrome: Causes, Symptoms and Treatment
Irritable Bowel Syndrome (IBS) is a chronic functional bowel disorder causing abdominal pain, bloating, and altered bowel habits without any structural cause.
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Irritable Bowel Syndrome (IBS) is a chronic functional bowel disorder causing abdominal pain, bloating, and altered bowel habits without any structural cause.
What is Irritable Bowel Syndrome?
Irritable Bowel Syndrome (IBS) is a chronic functional gastrointestinal disorder. This means that the bowel shows no detectable structural or biochemical damage, yet its function is significantly impaired. Symptoms are recurring and can considerably affect a person's quality of life. Globally, IBS affects an estimated 10-15% of the population, with women being diagnosed more frequently than men.
Causes
The exact cause of IBS is not yet fully understood. It is believed that multiple factors interact to produce the condition:
- Disrupted gut-brain axis: Faulty communication between the brain and the gut can alter the perception of bowel movements.
- Visceral hypersensitivity: Affected individuals perceive normal intestinal movements as painful.
- Altered gut microbiome: An imbalance in gut bacteria may contribute to the development of IBS.
- Psychological factors: Stress, anxiety disorders, and depression can trigger or worsen symptoms.
- Post-infectious IBS: IBS can develop following a gastrointestinal infection.
- Genetic predisposition: A familial clustering of IBS has been observed.
Symptoms
IBS symptoms vary widely between individuals. Common complaints include:
- Recurring abdominal pain or cramping, often related to bowel movements
- Bloating and a distended abdomen
- Diarrhea, constipation, or alternating between both
- Changes in stool consistency or frequency
- A feeling of incomplete bowel emptying
- Mucus in the stool
Symptoms often improve after a bowel movement. General symptoms such as fatigue, headaches, or back pain may also accompany IBS.
Diagnosis
There is no single test to diagnose IBS. Diagnosis is based on the Rome IV criteria: recurrent abdominal pain occurring on average at least one day per week in the last three months, associated with two or more of the following:
- Related to defecation
- Associated with a change in stool frequency
- Associated with a change in stool consistency
It is essential to rule out organic diseases such as Crohn's disease, ulcerative colitis, coeliac disease, or colorectal cancer through appropriate investigations (blood tests, stool analysis, colonoscopy).
Treatment
There is currently no cure for IBS. Treatment focuses on relieving symptoms and improving quality of life.
Dietary Modifications
A low-FODMAP diet (reducing certain fermentable carbohydrates) has proven effective for many patients. Keeping a food diary can help identify individual triggers.
Medication
- Antispasmodics to relieve abdominal pain and cramping
- Laxatives for constipation-predominant IBS or antidiarrheals for diarrhea-predominant IBS
- Probiotics to support gut flora balance
- Low-dose antidepressants in selected cases to modulate the gut-brain axis
Psychological and Complementary Therapies
- Cognitive Behavioural Therapy (CBT)
- Gut-directed hypnotherapy
- Stress management and relaxation techniques
References
- Mearin F. et al. - Bowel Disorders. Gastroenterology. 2016;150(6):1393-1407. doi:10.1053/j.gastro.2016.02.031
- Lacy B.E. et al. - ACG Clinical Guideline: Management of Irritable Bowel Syndrome. Am J Gastroenterol. 2021;116(1):17-44.
- National Institute for Health and Care Excellence (NICE) - Irritable Bowel Syndrome in Adults: Diagnosis and Management. Clinical Guideline CG61. 2017. www.nice.org.uk
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Related search terms: Irritable Bowel Syndrome + IBS + Irritable Colon