<unk>  refers to two related medical conditions which cause diarrhea: collagenous<unk>  and lymphocytic<unk> . Both conditions are characterized by the presence of chronic non-bloody watery diarrhea, normal appearances on colonoscopy and characteristic histopathology findings of inflammatory cells.
Microscopic colitis
Bile acid malabsorption
Collagenous colitis
Coeliac disease
Lymphocytic colitis
Crohn's disease
Cytomegalovirus colitis
Lactose intolerance