Excessive gas

Intestinal gas is entirely normal — everyone produces and passes wind many times a day. Excessive or bothersome gas comes from two sources: air that is swallowed (with fast eating, fizzy drinks, chewing gum or anxiety), which is mostly burped back up; and gas made when bacteria in the large bowel ferment food that hasn't been fully absorbed, particularly certain carbohydrates and fibre. So diet is by far the commonest driver — beans, pulses, onions, cabbage-family vegetables, fizzy drinks, and artificial sweeteners are classic culprits. Beyond diet, excessive gas with bloating and other symptoms can reflect food intolerances (such as lactose intolerance), irritable bowel syndrome, coeliac disease, or, less commonly, conditions that cause malabsorption or bacterial overgrowth. On its own, gas is a nuisance rather than a danger, but when it comes with weight loss, persistent change in bowel habit, or blood in the stool, the accompanying symptoms — not the gas — are what need attention.

• Diet — beans and pulses, onions, cabbage/broccoli family, wholegrains, fizzy drinks, artificial sweeteners.
• Swallowed air — eating quickly, chewing gum, fizzy drinks, anxiety.
• Lactose or other food intolerance — gas and bloating after specific foods.
• Irritable bowel syndrome — bloating and wind with abdominal pain and altered bowel habit.
• Coeliac disease — with other gut and nutritional symptoms.
• Constipation — trapped stool ferments and produces gas.
• Small intestinal bacterial overgrowth (SIBO) — less common.

Occasional gas is a normal, diet-related nuisance and needs no tests. When gas and bloating are persistent or come with other symptoms, targeted tests are guided by the picture: coeliac serology (anti-tTG with total IgA) to exclude coeliac disease, a full blood count and ferritin (iron deficiency can accompany coeliac or malabsorption), and CRP if inflammatory bowel disease is a concern. A trial of eliminating specific foods (such as lactose) often clarifies a dietary intolerance without testing. Mediora.AI can surface a coeliac or iron-deficiency pattern that fits a malabsorption cause; everyday gas is managed on diet, and persistent symptoms are assessed by your doctor.