Stomach bloating causes: what to know

Bloating may follow large meals, rapid eating, fizzy drinks, constipation, or changes in gut movement. Some people react to lactose or other foods without having an allergy. Irritable bowel syndrome can combine bloating with abdominal discomfort and altered bowel habits. Coeliac disease, giardiasis, and Helicobacter pylori infection are other conditions a clinician may consider when symptoms persist or come with diarrhoea, nausea, pain, or poor appetite.

The direction matters: these conditions can present with bloating, but bloating by itself does not establish any one diagnosis. Learn more in [Bloating](/symptoms/bloating/) and [Lactose Intolerance](/conditions/lactose-intolerance/).

Keep a short diary of meals, drinks, bowel movements, stress, medicines, and the time bloating begins. Notice whether passing stool or gas changes the pressure. Try slower eating and regular movement, while avoiding a series of restrictive diets without professional advice. A clinician may review your history and examination before selecting blood, stool, or breath tests. [Nutrition Counselling](/treatments/lifestyle-and-wellness/nutrition-counselling/) can support a structured food review.

Book an appointment when bloating is persistent, recurrent, or affecting daily activities, especially with unexplained weight loss, ongoing diarrhoea or constipation, vomiting, fever, blood in stool, or increasing pain. Get urgent help for severe sudden pain, a rigid or rapidly swollen abdomen, repeated vomiting, faintness, or breathing difficulty.

Which causes fit my timing and bowel pattern? Do I need assessment for [Food Intolerance](/conditions/food-intolerance/) or [Coeliac Disease](/conditions/coeliac-disease/)? Could [Irritable Bowel Syndrome](/conditions/irritable-bowel-syndrome/) explain the symptoms, and what should I monitor?