Diarrhoea and abdominal pain are some of the most common symptoms that  affect people of all ages with celiac disease.

Children may not gain weight or grow properly, while adults may find they lose weight. Malabsorption can also leave people tired and weak, because of anaemia caused by iron or folate deficiency.

Other possible symptoms include mouth ulcers, vomiting and abdominal pain. An itchy rash on the elbows and knees, called dermatitis herpetiformis, may occur.

Possible long-term problems include infertility, osteoporosis and bowel cancer.

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