When you have irritable bowel syndrome or IBS, your digestive symptoms can run the gamut from diarrhea to constipation, and probably include bloating, gas, and abdominal pain as well. Additionally, the symptoms of celiac disease and the symptoms of non-celiac gluten sensitivity are fairly similar to those of IBS. It's no surprise, therefore, that people have a tough time telling the three conditions apart.
Source: Verywell Health