What is the difference between celiac disease and non-celiac gluten sensitivity (NCGS)?

What is the difference between celiac disease and non-celiac gluten sensitivity (NCGS)?

Celiac disease causes damage to the small intestine. There are specific markers in the blood that help confirm the diagnosis. Non-celiac gluten sensitivity causes symptoms that may include nausea, vomiting, abdominal pain, headaches, diarrhea, joint pain, fatigue, and “brain fog." These might be slight or severe. However, NCGS does not injure the intestine; there are no specific markers in the blood; and the diagnosis requires improvement of symptoms after following a diet without gluten.