If you had colon cancer and it was to the point where it was pressing against your bladder you'd know...trust me. My mom had stage four metastic colon cancer. For years she had blood in every stool, terrible stomach pains. It wasn't a full ache or urinating. Bladder problems and colon cancer have next to no correlation...you don't have colon cancer. I'd put money on this. Most colon cancers start as polyps and take years (10 years) to become cancer... You probably drink a lot of water.