Hi.. Barium enema is a investigation done to see if there is a problem in the lower Gastrointestinal tract.. The procedure is not painful.. You will be given a enema with a radio opaque material and then a X ray will be taken.. It is done to check if there is any structural problem in the lower GI tract. Bariun enema X Ray's can pick up cancereous growth, but the diagnosis can only be done by a colonoscopy or a biopsy....