How common is unintentional weight loss in coeliac disease?

Coeliac disease is an immune reaction to gluten that can damage the small intestine. This may interfere with absorbing nutrients and can cause diarrhoea, bloating, abdominal discomfort, tiredness or reduced appetite. Some people have few digestive symptoms, so weight change may be one of the clues that prompts assessment. Other explanations include infection, thyroid problems, medicines, dental difficulties and emotional distress. The symptom alone cannot distinguish between these possibilities.

Book a primary-care appointment for ongoing or unexplained weight loss, particularly if it comes with persistent diarrhoea, bloating, mouth ulcers or fatigue. Testing for coeliac disease usually starts with a clinical review and blood tests. Do not begin a gluten-free diet before discussing testing, because removing gluten can affect the results. Keep eating and symptom notes, including bowel changes, appetite and any foods that seem to trigger discomfort.

Seek urgent care for severe abdominal pain, repeated vomiting, fainting, marked weakness, black stools or blood in the stool. Arrange prompt review when weight loss continues, eating becomes difficult or you show signs of dehydration such as very little urine, dizziness or a dry mouth.

Ask whether coeliac blood tests are suitable, whether you should continue eating gluten until testing is complete, and whether your symptoms suggest another cause. Discuss how to maintain nutrition while waiting for results and whether a dietitian would help.