The most common cause of bloating is gas in the gut, which can build up from foods and drinks such as fizzy drinks, beans, cabbage and other vegetables, or from swallowing air while you eat (Source: NHS, 2026). Constipation, food intolerance, coeliac disease, irritable bowel syndrome (IBS), and hormonal changes around your menstrual cycle can also cause bloating. For most people it settles with small changes to eating habits, though there are some signs worth taking to a GP, covered further down.
Who this is for
You're here because your stomach feels tight, swollen or uncomfortable, maybe after certain meals, maybe most days, and you want to understand why before deciding what to do about it. This article covers the everyday causes, what tends to help, and when gut discomfort is worth getting checked rather than managed alone.
The everyday causes of bloating
Gas is the main driver of bloating for most people. Some foods produce more gas as they're digested, particularly beans, lentils, cabbage, and other cruciferous vegetables, along with fizzy drinks and excess caffeine or alcohol (Source: NHS, 2026). Eating quickly, talking while you eat, or drinking through a straw can mean you swallow more air, which adds to the feeling of fullness and pressure.
Constipation is another common cause, since stool building up in the bowel can leave you feeling bloated and heavy. Large meals, especially late at night, and diets high in processed, sugary, or fatty food can also make bloating more likely (Source: NHS, 2026).
What tends to help
The NHS suggests a few straightforward changes: eating smaller, more frequent meals rather than large ones, chewing with your mouth closed to reduce air swallowing, drinking plenty of water, and exercising regularly, since movement helps digestion (Source: NHS, 2026). If constipation is the cause, soluble fibre such as oats can help, though the British Dietetic Association (BDA) advises increasing fibre gradually, since a sudden jump can make bloating worse rather than better (Source: BDA, 2026).
Cutting back on fizzy drinks, alcohol, and known gas-producing foods for a week or two, then reintroducing them one at a time, can help you spot your own triggers rather than cutting out entire food groups unnecessarily.
When it might be IBS
If bloating comes with stomach pain, changes in bowel habit, or a pattern you can't easily explain through diet alone, IBS is a common underlying cause. The BDA recommends eating regular meals, avoiding skipping meals, eating smaller portions, and taking time to eat without rushing, alongside reviewing specific food groups depending on whether wind, diarrhoea or constipation is the main symptom (Source: BDA, 2026). For persistent symptoms, a low FODMAP diet, which limits certain fermentable carbohydrates, is sometimes recommended, but the BDA is clear that this should be trialled with support from a dietitian rather than alone, to make sure your diet stays nutritionally balanced (Source: BDA, 2026).
When to see a GP
Occasional bloating after a heavy meal or a gassy food is rarely a concern. It's worth speaking to a GP if bloating is persistent, doesn't improve with diet changes, or comes with unintentional weight loss or blood in your stool (Source: NHS, 2026). Seek urgent advice by calling 111 if bloating comes with vomiting, diarrhoea, a fever, or an inability to pass stool or urine, and call 999 for sudden, severe stomach pain with a swollen abdomen or vomiting blood (Source: NHS, 2026).
Gas in the gut, often from certain foods, drinks, or swallowed air, is the most common cause of bloating (Source: NHS, 2026). Constipation, food intolerance, coeliac disease, IBS and hormonal changes are other common causes. Eating smaller, slower meals, staying hydrated, and increasing fibre gradually rather than suddenly are the main self-care steps recommended by the NHS and BDA. A low FODMAP diet can help with IBS-related bloating but should be trialled with a dietitian's support rather than alone. Persistent bloating, or bloating alongside weight loss or blood in stool, is a reason to see a GP rather than manage it yourself.
Questions people often ask
Beans, lentils, cabbage and other cruciferous vegetables, fizzy drinks, and excess caffeine or alcohol are common triggers, since they tend to produce more gas during digestion (Source: NHS, 2026). Triggers vary from person to person, so tracking what you eat alongside how you feel can help identify your own.
Usually not. Occasional bloating after certain foods or a big meal is common and not a cause for concern. It's worth seeing a GP if bloating is persistent, doesn't settle with diet changes, or comes with unintentional weight loss or blood in your stool (Source: NHS, 2026).
Eating smaller, slower meals, chewing thoroughly, staying hydrated, and cutting back on known gas-producing foods and fizzy drinks are the main self-care steps recommended by the NHS (Source: NHS, 2026). If constipation is a factor, gradually increasing soluble fibre can help.
A low FODMAP diet is sometimes suggested for IBS-related bloating, but the BDA recommends trying it with support from a dietitian rather than alone, so your diet stays balanced while you work out your triggers (Source: BDA, 2026).
See a GP if bloating is ongoing, doesn't improve with diet changes, or is accompanied by unintentional weight loss or blood in your stool. Call 111 if it comes with vomiting, fever, or an inability to pass stool or urine, and call 999 for sudden severe pain with a swollen abdomen (Source: NHS, 2026).
This article is for general information only and is not a substitute for professional medical advice. If you are concerned about a specific symptom, please see a GP or other qualified healthcare provider.