 [ Symptoms ] can food posioning cause blood in my stool  five hours into excessive vomiting and diahreah now there is blood in my stool should i be more concerned or seak immediate care [ Disease ] yes bloody diarrhea is concerning and should be evaluated immediately by a doctor bloody diarrhea due to e coli 0157h7 infection can sometimes have severe complications bloody diarrhea can also be caused by salmonella shigella and campylobacter infections there are some other serious non infection related conditions that can also be associated with bloody diarrhea that should be evaluated by a doctor hope this helps take care