It seems like every time I go out, I get the sudden urge to use the bathroom. I'm not talking about taking a piss. I feel like I have to go and take a number 2. Yet, before I leave my house and hours before that my stomach feels fine. But once I go out I start getting stomach pains and get an urge to use the bathroom. I went to the Gastroenterologist a few weeks back and they did a check up and stuff. They said I could possibly have Chron's Disease, but I did some research right after and have none of the symptoms like diarehia,bad long lasting stomach pains,and bloody stool. So tomorrow I am suppose to be getting a Colonscopy just to make sure I don't have Chron's Disease or anything else. I personally don't think I do but I guess it's better to be safe than sorry. But my question is, why does this happen? My stomach can be fine the whole day if I stay inside, but once I go out my stomach begins to hurt and I feel like I always have to use the bathroom. Is this all in my head or...?