53 yr old female, vomiting, diarrhea, rectal bleeding, fever x2 days. came on suddenly. what would cause this?

Rectal bleeding: Vomiting and diarrhea associated with fever and rectal bleeding necessitates evaluation by your doctor. Please call your doctor or go to an urgent care center or hospital ed.

Gastroenteritis: Sudden onset of diarrhea with vomiting, bloody diarrhea speaks for a possible bacterial infection. Make an appointment asap with your doctor orgo to an er so you can get a stool culture done and get started on proper treatment.

Seek Medical Care!: Your symptoms are consistent with a serious gastrointestinal infection. Including colitis or dysentery. C diff colitis is a possibility if you have had recent antibiotics or have been exposed to another person infected. Other options include salmonella, shigella, enterotoxic e coli, ischemic colitis, less likely diverticulitis. Seek medical care!