 There are not studies that validate a classification of colon inflammation using CLE in IBS patients. Inflammation of the colon mucosa in ulcerative colitis UC has been described previously using CLE. Kiesslich et al. reported on a 3-grade classification of inflammation activity by CLE, combining crypt architecture, cellular infiltrations, and vessel architecture. Nevertheless the assessment of cellular infiltration has been questioned because of the difficulty in differentiating cell types by CLE. Chang-Qing Li, et al. used three CLE parameters to evaluate inflammation in UC patients: a 4-grade crypt-architecture classification, fluorescein leakage, and microvascular alterations. On the other hand, the Miami classification for pCLE defines colitis using: crypt fusion and distortion, bright epithelium, dilated and prominent branching vessels.In the present study the parameters used for CLE inflammation will be: 1.Epithelial gaps followed by leaks with secretion of fluorescein into the lumen. In CLE images of normal colonic mucosa, the lumen of the crypt is free of fluorescein and appears as a dark center in the crypt; however, in inflamed mucosa, fluorescein leaks into the crypt lumen; therefore, the lumen is brighter than the surrounding epithelium. 2.4-grade crypt-architecture classification: Types A and B will be considered as normal and chronic inflammation, respectively, and types C and D indicate acute inflammation. Type A: Regular arrangement and size of crypts. Type B: Irregular arrangement of crypts, enlarged spaces between crypts. Type C: Dilation of crypt openings, more irregular arrangement of crypts, and enlarged spaces between crypts as compared to type B. Type D: Crypt destruction and or crypt abscess. 3.Dilated and prominent branching vessels 