Hi, Noted your short history of a known problem of ulcerative colitis, has a fall on back and developed passing blood with flatulence. One of the commonest causes of enhancement of symptoms in ulcerative colitis is obviously stress, anxiety, physical or mental trauma. Another reason in your case can be related to the indirect trauma to the large bowel and thus enhancement of symptoms. Hence I would advise you the following: Consult your Doctor immediately for clinical evaluation and examination. CT scan of abdomen and back also for a possible trauma. Tests of blood and stool. An appropriate should be started immediately. Take plenty of oral fluids. Prebiotics and probiotics. Activated charcoal. Further management under the guidance of a Specialist or the Doctors who treat you regularly. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. T. Chandrakant, ENT and General Surgeon