Celiac disease is a digestive disorder in which an immune response is triggered by the body when gluten is consumed. This immune response attacks the small intestine, causing damage and preventing the body from absorbing important nutrients. 

Symptoms of celiac disease include digestive and stomach issues, such as gas and diarrhea. It can be accompanied by feelings of lethargy and aches, which are often worse following consumption of foodstuffs containing gluten - a protein found in grains, such as rye, wheat and barley. 

Other signs of celiac disease may include bone or joint pain, arthritis, anxiety, depression, itchy skin, irregular menstruation and mouth sores. Children with the condition may experience slower growth and weak bones and may become very ill if left untreated. 

The first treatment for celiac disease is usually a change in diet, which may require a consultation with a specialist dietician. Patients may also be advised to take vitamin supplements, such as vitamin D, vitamin B12, calcium, iron and vitamin K.