Hi, I am 27years old, suffering from ulcerative colitis last 4years , there is adonomotus polyps also in my colon, so I would like to know that my second colonoscopy was done three years back and my gestroentrology didn't colonoscopy yet. So is it safe and no need to go for colonoscopy.   Second things is that I am under weight and my weight is not increasing while my all symptoms are normal.so what should I do to gain weight as soon as possible.