Causes of belching and gas

Belching releases air from the upper digestive tract. Intestinal gas is produced when gut bacteria break down some carbohydrates, and it can also increase when air is swallowed. Fizzy drinks, rapid eating, gum, straws, smoking, constipation, and changes in diet may increase symptoms. Acid reflux may add burning or a sour taste. Gastritis may cause upper-abdominal soreness or nausea. Irritable bowel syndrome can pair gas with bloating, abdominal pain, diarrhoea, constipation, or alternating bowel habits. A hiatus hernia may support reflux. The symptom combination is useful, but it does not prove a diagnosis.

Try eating more slowly and taking time to chew. Reduce fizzy drinks and observe whether beans, onions, large portions, or sugar-free products trigger gas. Gentle movement can support bowel activity. Keep a diary for meals, stool pattern, pain, and timing so a clinician can see whether symptoms follow particular foods or occur independently. Do not start restrictive diets or medicines without checking that they are suitable for you.

Book an appointment when symptoms are new and persistent, steadily worsening, or affecting eating and sleep. Contact a clinician sooner for ongoing vomiting, difficulty swallowing, persistent diarrhoea or constipation, blood in stool, unexplained weight loss, fever, or ongoing abdominal pain. Emergency care is appropriate for severe sudden pain, fainting, breathing difficulty, or chest pain.

Ask which symptoms suggest reflux rather than swallowed air, whether your bowel pattern needs investigation, and whether a medicine or food change could explain the timing.