What is the difference between celiac disease and gluten sensitivity? Or, are they the same?

Effect on the body. You can be intolerant or react to gluten containing products with cramping, diarrhea, hives , etc. If this occurs and your blood test and or intestinal biopsy are positive for tissue damage markers, anti-intestinal antibodies you have celiac. A negative set of blood tests/biopsy suggest just intolerance. Both issues are complex and the rational approach to management is the same, avoid gluten.