Gluten sensitivity is often used as an umbrella term for anyone who reacts negatively to gluten, including those with celiac disease. But gluten-sensitivity is the “soft” version, compared to the “hard” versions of celiac disease and gluten intolerance. You can be sensitive to gluten, but not necessarily be gluten intolerant.
Unlike celiac disease and gluten intolerance, with gluten-sensitivity you can experience fleeting gastrointestinal discomfort or other annoying symptoms, but there is no dramatic physical change when gluten is either consumed or removed from the diet. Dramatic is the operative word. Gluten-sensitivity may encourage you to eat less gluten in your diet to feel better, but your symptoms are not as full-blown as the symptoms associated with celiac disease and gluten intolerance.
With gluten-sensitivity, you may choose not to eliminate gluten entirely from your diet and merely accept the occasional discomfort. Gluten-sensitivity may not medically require the removal of gluten from the diet, whereas celiac disease and gluten intolerance do.