I've been having bowel problems since september. My shits were mostly runny and almost never solid. At first they were yellow and slimy so I thought it was a bowel infection. That stopped, then they turned green. That stopped and now Im constantly gassy. This morning I had another pasty shit and it was black. A few minutes ago I had a solid shit but it was also black. Im scared of attributing this to intestinal bleeding. Best case scenerio I might have a parasite. Worst case, its cancer, but I had an ultrasound a few months back and the doctor didnt find anything out of the ordinary so I doubt a tumor has grown enough to cause that much blood. I have an appointment next week but I would like some input.