I have cancer of the Urethra and Ureters near the bladder and I have to have a CT IPV scan on wednesday to find out how far it has spread. I want to know why blood in my urine comes and goes. Like it is there but I may have a good few weeks break from this and then it comes back again why is this. I want to say this right now I do not have any infection but cancer. I have been checked for all infection in the bladder and nothing came up regarding this. I even had one done 3 days ago and no infection, but I do get alot of offensive odour that is almost deadly. I heard cancer is offensive. YUCK. and I get cramps in my guts sometimes like a period pain but with no periods and I was told this could all be related including the lower back pain I get a lot. So I just want to find out why is the blood in the urine there and then not for many weeks then it comes bakc again. Please help. I will be asking my specialist this on wednesday but I am anxous now.