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The key difference lies in tissue involvement: ulcerative colitis affects colonic mucosa only, while Crohn’s disease may involve any gastrointestinal segment from mouth to anus. Both diseases commonly begin in early adulthood, with additional later incidence, and have similar life expectancy to the general population despite frequent morbidity and some need for surgery. IBD pathophysiology involves genetic susceptibility and abnormal immune responses to environmental triggers such as intestinal bacteria, with inflammatory mediators like TNF-α, IL-12, and IL-23. Environmental risk patterns include smoking effects and dietary associations, while altered commensal microbiota and appendicectomy-related protection (for UC) are noted. Pathology descriptions contrast continuous mucosal inflammation with proctitis and pseudopolyps in UC versus transmural, deep ulceration, cobblestone appearance, skip lesions, and potential fistulae in Crohn’s.",{"@graph":69,"@context":105},[70,84],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/introduction-to-inflammatory-bowel-disease/26704/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/introduction-to-inflammatory-bowel-disease/26704.png","ImageObject",300,407,{"name":92,"@type":93},"Asher","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-09-19","2026-05-08",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction","https://schema.org",{"og:url":107,"og:type":108,"og:title":65,"og:site_name":95,"og:description":67},"https://docshare.wps.com/document/introduction-to-inflammatory-bowel-disease/26704","article",{"robots":110,"canonical":107},"index,follow",{"doc_id":112,"site_id":62},26704,1778199471,{"code":4,"msg":5,"data":115},{"doc_id":112,"user_id":116,"nickname":92,"user_avatar":117,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":66,"file_id":118,"file_url":119,"file_type":120,"file_size":121,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":122,"language":123,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":66,"faqs":66,"seo_title":124,"seo_description":67,"update_tm":113,"read_time":125},687197207639,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","cbCaitCtYwXcNoPf","https://ap.wps.com/l/cbCaitCtYwXcNoPf","pdf",15681596,41,"English","Introduction to Inflammatory Bowel Disease | PDF",103]