How common is diarrhoea in coeliac disease?

Coeliac disease is an immune reaction to gluten that damages the lining of the small bowel. When that lining is inflamed, the bowel may not absorb nutrients and fluid as it should, leading to loose or frequent stools. Some people instead notice bloating, abdominal discomfort, tiredness, weight change, constipation, or no obvious digestive symptoms. Diarrhoea has many possible causes and cannot diagnose coeliac disease on its own.

If coeliac disease is being considered, arrange a medical assessment before starting a gluten-free diet. Removing gluten first can affect the tests used to investigate the condition. Keep a simple note of symptoms, food intake, bowel changes, and any family history of coeliac disease. A clinician can decide whether blood tests or further assessment are appropriate.

Book a timely appointment for diarrhoea that persists, keeps returning, or is accompanied by unexplained weight change, ongoing fatigue, abdominal pain, or symptoms after eating gluten-containing foods. Seek urgent care for blood in stool, black stool, severe abdominal pain, fainting, confusion, or signs of dehydration such as very little urine or dizziness.

Ask which tests should be done while you are still eating gluten, whether another bowel condition could explain your symptoms, and whether a dietitian referral would help if coeliac disease is confirmed. Mention medicines, supplements, and any close relatives with coeliac disease.