Well, it is very odd. There use to be a restaurant that I use to go to many years ago. Every time I ate a salad there, I would get ill. Well, it happened at a restaurant we went to last night. I started feeling ill and my stomach was cramping. I have not felt well all day. The odd thing is that when I order something from a steak delivery company, their salads never bother me. My daughter says it could be what some places wash the lettuce in. I do not have a clue as to what is causing this but I wish it would quit.
Some restaurants spray their lettuce with a substance (?) to keep it looking fresh and green. You could be allergic to that.