Gluten intolerance can overlap with celiac disease symptoms. For example, if you are sensitive to gluten, you may experience GI symptoms like bloating, constipation, diarrhea and stomach cramps. It may be that you can eat a certain amount of gluten before you experience symptoms. But a person with celiac disease will have a reaction after eating just one crumb of a food containing gluten. Also, if you just have a gluten sensitivity, your symptoms will be tied to the amount of gluten you ate and how long ago you ate it. For someone with celiac disease, the symptoms can last for days, and inflammation can be seen on blood tests after that for weeks.