Sigmoidscopy is thought to be one of the basest and most essential tools for evaluation of colorectal patient because it could be performed in an out patient clinic with only minimal bowel preparation. AIM: The aim of this study was to assess the patient's best position for sigmoidoscopy. MATERIALS AND METHODS: Between March 4, 1997 and April 18, 1997, all patients who visited the colorectal clinic at the Dept. of Surgery, Korea Veterans Hospital were alternately underwent sigmoidoscopy in these four different positions: supine(S), left lateral(L), right lateral(R), and jack-knife(J). Sigmoidocopy was routinely performed for all patients who had lower gastrointestinal problems and was done by two well traind surgeons who had performed more than 100 sigmoidoscopies previously to this study, The patients who could not be tolerate insertion of the total length (60 cm) of the sigmoidoscope due to poor bowel preparation and/or complete obstruction by a mass were excluded. We evaluated the patient's complaints according to minimal, moderate, and severe discomfort and time between start and complete insertion of the 60 cm length of the sigmoidoscope. Statistical analysis was performed by an appropriate Anova test and Fisher's exact test. RESULTS: There were no differences among these four groups relative to age(5; 58.0+/-12.7, L; 64.3+/-10.0, R; 62.0+/-10.1, J; 56.0+/-12.9), gender(5; 76%, L; 70%, R; 72%, J, 83%,male ratio), degree of discomfort (mild: 42.9% (5), 50% (L), 33.3%(R), 66.7%(J), moderate: 42.9%(5), 34.6%(L),25%(R), 13.3%(J), severe: 14.3%(5), 15.4%(L), 41.7%(R), 20%(J)) and duration of insertion of the sigmoidoscope(5; 264.4 +/-192.9, L; 226.5 +/-267, R; 301.6+/-361.3, J; 202.5 +/-117.8 seconds). Also, there were no statistical significances between the two groups according to the surgeon who performed the procedure. CONCLUSION: The best position for sigmoidoscopy does not depend on the patient's position. Therefore, allowing the patient to change his position during the procedure would be the best way for an easy and comfortable sigmoidscopy.