Secretory Diarrhea.

Infectious: viral damage to mucosal epithelium

Rotavirus

Caliciviruses

Enteric adenoviruses

Astroviruses

Infectious: enterotoxin mediated

Vibrio cholerae

Escherichia coli

Bacillus cereus

Clostridium perfringens

Infectious: damage to mucosal epithelium

Shigella

Salmonella

Campylobacter

Entamoeba histolytica

Neoplastic

Tumor elaboration of peptides, serotonin, prostaglandins

Villous adenoma in distal colon (nonhormone mediated)

Excess laxative use.