Objectives: 1.Tofind out the most common cause of lower Gastrointestinal tract bleeding in our setup as diagnosed with sigmoidoscopy 2. To measure the frequency of colorectal carcinoma with special reference to age and sex distribution 3. To compare the assessment of findings in prepared and unprepared gut on sigmoidoscopy. Design: Prospective, descriptive study. Period: Eight months study (January 2002 to June 2003). Setting: Surgical Unit III, Allied Hospital/PMC Faisalabad. Patients & Methods: 50 cases presented with mild to moderate lower GIT (Gastrointestinal tract) bleeding and underwent sigmoidoscopy and biopsy and histopathology reports were studied. Results: The most common cause of lower GIT bleeding as diagnosed by sigmoidoscopy was non specific colitis(46%) followed by colorectal carcinoma (18%), ulcerative colitis (16%) and a small percentage of benign rectal polyps, villous adenoma, and carcinoid tumour. Colorectal carcinoma was an important cause of lower GIT bleeding. In this study most of the cases of colorectal carcinoma presented in younger age group (55.5 %