A: Are you feeling OK? B: My stomach is bothering me. A: What have you been eating? B: I had a ham sandwich with mayonnaise for lunch. A: Maybe the food had something wrong with it. B: It could be bad food, but I didn't feel so well yesterday, either. A: Have you been under a lot of pressure lately? B: I haven't been under any more stress than usual. A: Perhaps you have caught that bug that is going around. B: I feel like maybe I am coming down with the flu.