text: If it is bright blood it could mean hemorrhoids. I would eat more fiber. If it is old dark blood you could be loosing blood through your bowels and you should see a doctor. They will do a stool sample. Some medicines cause this. Do you take aspirin or any arthritis meds? This can be serious. You can loose enough blood to lower your RBC's (red blood count) Get checked it could be serious or just minor like hemorrhoids