No definite cause has been determined. The peak incidence of<unk>  is in persons over age 50; the disease affects women and men equally. Some reports have implicated long-term usage of NSAIDs, proton pump inhibitors, and selective serotonin reuptake inhibitors, and other drugs. Associations with other autoimmune disorders suggests that overactive immune responses occur.
Lymphocytic colitis
Collagenous colitis
Microscopic colitis
Cytomegalovirus colitis
Diversion colitis
Chemical colitis
Ulcerative colitis
Strongyloidiasis