Bloating, a benign nuisance or a red flag?

Bloating and abdominal distension are common in general practice and are often functional. They are frequently associated with under-recognised constipation, IBS-related visceral hypersensitivity, and dietary factors such as FODMAP intolerance.

A careful history is essential to distinguish functional symptoms from red flags. Consider symptom pattern and duration, bowel habit changes, dietary triggers, and response to simple measures.

Initial management for those with typical features of IBS or functional bloating may include:
  • Optimising bowel habits (responding to urges, adequate time, hydration, use of a footstool)
  • Bowel “reset” (e.g. Moviprep) where appropriate
  • Maintenance with PEG or magnesium-based laxatives
  • Patient education on overflow diarrhoea and realistic expectations
  • Dietary review, including FODMAP considerations
  • Referral to a dietitian or pelvic floor physiotherapist where indicated
    However, red flag features should prompt further investigation or referral. These include:
        • Unintentional weight loss
        • Iron deficiency anaemia (which may result from menstrual blood loss in females, but is not limited to this cause)
        • Persistent vomiting
        • Rectal bleeding
        • New onset symptoms in patients over 45–50 years
        • Family history of bowel or ovarian cancer

          Persistent or unexplained bloating may occasionally be associated with coeliac disease, inflammatory bowel disease, small intestinal bacterial overgrowth (SIBO), or less frequently, malignancy, and further evaluation may be warranted.

          Referral to a gastroenterologist may be appropriate when alarm features are present, symptoms are persistent despite initial management, or the diagnosis remains unclear. Specialist assessment can help guide appropriate investigation and management. 

          Reviewed by Dr Shamilah Lachal on 25 March, 2026.

          Disclaimer – This article is for general information and educational purposes only. It is not a substitute for professional advice. Always consult a registered health professional regarding any health-related diagnosis or treatment options.