Coeliac disease is caused by an adverse reaction to gluten, which is a dietary protein found in 3 types of cereal: wheat, barley, and rye. Gluten is found in any food that contains those cereals. Gluten causes inflammation (swelling) in the intestines and damages the villi, the hair-like structures on the lining of the small intestine. Nutrients from food are absorbed by the villi. If the villi are damaged, the person cannot absorb nutrients and ends up malnourished, no matter how much he or she eats.

Signs and symptoms:

• No symptoms at all
• Digestive problems (abdominal bloating, pain, gas, constipation, diarrhea, pale stools, and weight loss).
• A severe blistering skin rash and sores in the mouth.
• Unexplained anemia or hepatitis.
• Musculoskeletal problems (muscle cramps, joint, and bone pain) and defects in dental enamel.
• Growth problems and failure to thrive (in children). This is because they cannot absorb the nutrients.
• Tingling sensation in the legs (caused by nerve damage and low calcium).

When to see a doctor?

Consult your doctor if you have diarrhea or digestive discomfort that lasts for more than two weeks. Consult your child's doctor if your child is pale, irritable or failing to grow or has foul-smelling, bulky stools. Be sure to consult your doctor before trying a gluten-free diet. If you stop or even reduce the amount of gluten you eat before you're tested for celiac disease, you can change the test results. Celiac disease tends to run in families. If someone in your family has the condition, ask your doctor if you should be tested.

https://www.mayoclinic.org/diseases-conditions/celiac-disease/symptoms-causes/syc-20352220

https://www.nhs.uk/conditions/coeliac-disease.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Carpal-Tunnel-Syndrome-Fact-Sheet