I am a female and over fifty. For the past two months, I have had constant belching. I am scheduled to have a colonoscopy, but I am scared. I have not had unexplained weight loss or a change in bowel habits. I do have a couple internal polyps or hemorroids inside my anal tract. Do you think the belching is a side effect of any type of cancer. If so, do you think this is just the beginning stages of such a cancer? Please help!