With ulcerative colitis, emergency surgery is indicated for: (1,2)
- haemorrhage
 - perforation
 - toxic megacolon
 - severe flares which have failed course of high dose steroids, complete bowel rest and intravenous feeding
 - development of colonic carcinoma
 
Elective surgery is indicated for:
- intractable symptoms
 - long-standing active disease which increases the risk of carcinoma
 - intolerable side effects of medical treatment
 - development of mucosal dysplasia
 - diagnosis of carcinoma
 - colonic stricture
 - growth retardation in children
 
Reference
- NICE. Ulcerative colitis: management. NICE guideline NG130. Published May 2019, reviewed February 2025
 - Rubin DT, Ananthakrishnan AN, Siegel CA, et al. ACG clinical guideline: ulcerative colitis in adults. Am J Gastroenterol. 2019 Mar;114(3):384-413.