Hello, Thank you for your query. Please call your gastroenterologist right away. If that is not possible, see your physician. *how old are you? *what is your height and weight? *do you smoke or consume alcohol? *are you male of female? *how often do you have rectal bleeding? *what was the result of the colonoscopy? *do you have any other medical issues or take any medications? *any history of hemorrhoids? I recommend : -a urgent visit to the gastroenterologist /Physician /ER (if you are not able to see your doctor) -colonoscopy to check for source of bleeding and to arrest it. -blood tests (complete blood count, clotting profile, liver and kidney function tests) Based on this a diagnosis can be made and treatment initiated. Rectal bleeding is not normal and needs to be stopped as soon as possible. I urge you to seek medical attention right away. Do not drive. Hope this helps. Please let me know if there is anything else I can help you with. Wish you good health.