When should you worry about diarrhoea if you have coeliac disease?

Diarrhoea is a common presentation of Coeliac Disease. Gluten exposure can trigger inflammation in the small intestine, which may interfere with digestion and absorption. Symptoms can continue if gluten is hidden in food, if preparation causes cross-contact, or if another bowel problem is present.

Ongoing loose stools may be accompanied by bloating, tiredness, abdominal discomfort, or unintended weight change. These symptoms do not prove the cause, so a clinician may need to review the diagnosis, diet, medicines, and other possible explanations.

Keep a record of meals, symptoms, stool changes, medicines, and any accidental gluten exposure. Check labels and preparation areas if you follow a gluten-free diet, and avoid making major dietary restrictions beyond medical advice. Drink regularly, especially after loose stools.

Do not stop prescribed treatment without guidance. If you have not yet been tested for coeliac disease, speak with a clinician before removing gluten, because testing may be affected by a gluten-free diet.

Arrange prompt review when diarrhoea continues, returns despite careful gluten avoidance, or is affecting sleep, work, eating, or hydration. Seek urgent help for severe or localised abdominal pain, repeated vomiting, fainting, confusion, very little urine, black stool, or visible blood.

Ask for earlier assessment if there is ongoing weight loss, marked weakness, fever, or difficulty eating and drinking. Bring your food and symptom record so the clinician can look for patterns without assuming that every flare has the same cause.

Ask whether symptoms suggest gluten exposure, whether blood tests or other checks are needed, how to replace fluids and nutrients, and when a dietitian or gastroenterology review would help.