Posted 1/17/2017 3:50 PM (GMT 0)
Well, you don't normally get bleeding with stomach bugs - blood comes from rectal inflammation or piles. Other than that, I don't think there is any good way of telling. Once I was convinced I had got food poisoning from an oyster, as I was so sick later on that night. But my mum had had oysters as a starter too, and she wasn't sick. My Crohn's was very active at that time, so it was probably that (as I'd had a large, rich meal) - but I couldn't tell for sure.