| Disease | Cases (%) |
| Colorectal diverticulum | 113 (17.1) |
| Hemorrhoid | 85 (12.9) |
| Ischemic colitis | 80 (12.1) |
| AHRU | 75 (11.3) |
| Hemorrhagic colitis | 57 (8.6) |
| Colonic cancer | 51 (7.7) |
| Iatrogenic disease | 43 (6.5) |
| Small intestinal disease | 38 (5.8) |
| Colonic polyp | 36 (5.5) |
| Colonic ulcer | 34 (5.2) |
| Others | 48 (7.3) |
| Total | 660 (100) |