Is your bloating actually normal?
Bloating is one of the most common gut complaints, but the pattern matters. Some are entirely normal. Others point to a specific cause. Enter your symptoms to see what your pattern looks like against the population data.
Frequency and timing
Analysing your pattern…
Do I have IBS?
Apply the Rome IV criteria used in primary care to your specific symptom pattern.
How common is bloating?
Self-reported bloating affects between 16 and 19% of adults according to a major population study of 4,000 people (Jiang et al. 2008). Functional abdominal bloating, defined under the Rome IV criteria as bloating or distension without another explanation, affects 3.5% of the global population (Sperber et al. 2021, N=73,076). So while occasional bloating is extremely common, frequent unexplained bloating is less so and more worth investigating.
What causes food-related bloating?
The most common food-related cause of bloating is fermentation of poorly absorbed carbohydrates by gut bacteria. Dairy products contain lactose, which around 65-70% of the global population cannot fully digest in adulthood. Wheat and rye contain fructans, which are poorly absorbed even in people without coeliac disease. Onions, garlic, beans, and legumes are high in other fermentable fibres. The FODMAP framework classifies these triggers and forms the basis of a dietary intervention shown to reduce bloating in IBS patients.
When should I see a doctor about bloating?
Bloating that occurs daily and is accompanied by pain, blood in stool, unexplained weight loss, a change in bowel habit, or fever warrants prompt medical attention. Bloating starting after age 50 with new pain should be investigated. These can be red flags for conditions including colorectal cancer, inflammatory bowel disease, or coeliac disease. Do not rely on this tool if you have any of these symptoms.
Frequently asked questions
Irritable bowel syndrome (IBS) is a functional gut disorder defined by the Rome IV criteria as recurrent abdominal pain at least one day per week in the past three months, associated with two or more of: a change in stool frequency, a change in stool form, or relief or worsening related to defecation. Bloating alone is not sufficient for an IBS diagnosis. What distinguishes IBS bloating from normal post-meal bloating is the presence of pain and bowel habit changes that form a consistent pattern. Our Do I Have IBS quiz applies the Rome IV criteria to your specific pattern.
The evidence for probiotics in bloating is mixed. Some randomised trials show modest reductions in bloating with specific strains, particularly Lactobacillus plantarum 299v and Bifidobacterium infantis 35624. However, the effect sizes are generally small, and most studies are short-term. Probiotics are unlikely to cause harm but should not be seen as a substitute for identifying and addressing the underlying cause of frequent bloating. If your bloating is food-related, dietary modification is likely to be more effective than supplementation. Browse probiotics on Amazon →
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- Sperber AD et al. Worldwide Prevalence and Burden of Functional Gastrointestinal Disorders. Gastroenterology. 2021;160(1):99-114. N=73,076.
- Jiang X et al. Prevalence and risk factors for abdominal bloating and visible distension. Gut. 2008;57(6):756-763. N=4,000.
- Lacy BE et al. Bowel Disorders. Gastroenterology and Hepatology. 2011.
- Rome IV Diagnostic Criteria for Functional GI Disorders. 2016.
- ACG Clinical Guideline: Management of Irritable Bowel Syndrome. 2021.