Can holding your stool in cause colon cancer when you are 50?

No! But it's not a good idea! when your body sends you the signal that is time to move her bowels, you should listen. It's really pretty smart. Obviously, one cannot always get to a bathroom when we get that signal. But if you do, go move your bowels. Your colon, rectum, and especially the hemorrhoidal veins will thank you (prevent hemorrhoids!) good luck!