The goal of this observational study is to search for accurate diagnoses for patients with chronic diarrhea and assess the prevalence of microscopic colitis. The main question\[s\] it aims to answer \[is/are\]: Does microscopic colitis account for a significant portion of patients with chronic diarrhea? Participants will subjected to: * Routine laboratory examination. * Colonoscopy: A total colonoscopy will be done with visualization of the terminal ileum. Biopsies will be taken from each segment of the colon and any abnormal appearing areas, the right-sided colon (cecum, ascending colon, and transverse colon), the left-sided colon (descending colon and sigmoid colon), and the rectum.
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Number of Participants with Chronic Diarrhea Diagnosed with Microscopic Colitis
Timeframe: 6 weeks