I get gas buildup but not poop coming out for three days only mucus with some blood. This is the third time I am getting this. I have no bowel movements for three days only mucus with blood. I did stool test and found nothing not even blood. I did blood test and didn't find anything but was at day I had bowel movement. https://photos.app.goo.gl/QSpGC617P78pJ9Hz8 Initially doctor thought it might be UC or food poisoning. Now he says that there is a very slim chance to be UC and I have booked orthoscopy. He says that it is unlikely to be cancer and it could be hemorrhoids related. But it seems strange to me. I have to pain, only some bloating. Can this be cancer?