Aluminum toxicity
Antimony toxicity<unk> 
Barium toxicity
Bismuth toxicity
Cadmium toxicity
Chromium toxicity
Cobalt toxicity
Copper toxicity
Gold toxicity
Iron toxicity
Lead toxicity
Lithium toxicity
Manganese toxicity
Mercury toxicity
Nickel toxicity
Phosphorus toxicity
Platinum toxicity
Selenium toxicity
Silver toxicity
Thallium toxicity
Tin toxicity
Zinc toxicity
Viral (e.g. rotavirus)
Bacterial
Campylobacter
Shigella
Salmonella (non-typhi)
Escherichia coli
E. coli 0157:H7
Yersinia enterocolitica
Vibrio cholerae
Clostridium difficile
Parasitic
Giardia lamblia
Cryptosporidium
Entamoeba histolytica
Cyclospora
Microsporidium
Toxin
Staphylococcus aureus
Bacillus cereus
Campylobacter
Shigella
Salmonella (non-typhi)
Escherichia coli
E. coli 0157:H7
Yersinia enterocolitica
Vibrio cholerae
Clostridium difficile
E. coli 0157:H7
Giardia lamblia
Cryptosporidium
Entamoeba histolytica
Cyclospora
Microsporidium
Staphylococcus aureus
Bacillus cereus
GI Bleed
Appendicitis
Mesenteric Ischemia
Diverticulitis
Adrenal Crisis
Thyroid Storm
Toxicologic exposures
Antibiotic or drug-associated
Enterotoxigenic E. coli (most common cause of watery diarrhea)
Norovirus (often has prominent vomiting)
Campylobacter
Non-typhoidal Salmonella
Enteroaggregative E. coli (EAEC)
Enterotoxigenic Bacteroides fragilis
Giardia lamblia
Cryptosporidiosis
Entamoeba histolytica
Cyclospora
Arsenic toxicity
Aluminum toxicity
Mercury toxicity
Antimony toxicity
Methane toxicity
Mold toxicity
Barium toxicity
Gold toxicity