Acute diarrhea
Chronic diarrhea
Irritable bowel syndrome
Small intestinal bacterial overgrowth
Lactose intolerance
Chronic pancreatitis
Microscopic colitis
Inflammatory bowel<unk> 
Non-celiac gluten sensitivity (NCGS)
Wheat allergy
Vitamin or mineral deficiency
Celiac disease
Acute diarrhea
Crohn's disease
Chronic diarrhea
Gastroesophageal reflux disease
Irritable bowel syndrome
Small intestinal bacterial overgrowth
Post-infectious irritable bowel syndrome