Hi
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Abdominal pain, nausea, gas, diarrhea, joint pain and fatigue can be due to Crohn's, IBS, ulcerative colitis or celiac disease.
Pancreatic enzyme disorders, liver dysfunction, HIV, cancer of the gut, and infections by parasites (giardiasis, amoebiasis) can all cause persisting diarrhea. Lyme and lupus are other possibilities that present this way. Please discuss this with your doctor (GI doctor).