Crohn's Disease vs Ulcerative Colitis: The IBD Discrimination
Both are inflammatory bowel disease, both cause chronic diarrhea, and both show up in young adults — but the NCLEX expects you to know exactly which one causes fistulas and which one causes bloody mucoid stools. Picking the wrong complication or telling a client surgery will cure Crohn's is a missed question every time.
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- Transmural — full bowel-wall thickness
- Mouth to anus
- Skip lesions, terminal ileum
- Continuous inflammation, no skip areas
- Rectum & colon only
- Mucosal/submucosal
- Semi-formed non-bloody stool
- RLQ pain
- Steatorrhea, weight loss, malabsorption
- ★Bloody diarrhea with mucus
- 10–20 stools/day
- LLQ cramping, tenesmus
- ★Cobblestone mucosa on endoscopy
- Deep linear ulcers, skip pattern
- Pseudopolyps, friable mucosa
- Continuous erythema from rectum
- Monitor malabsorption, weight loss
- Replace B12 (ileal disease)
- Low-residue diet in flares
- Watch toxic megacolon: distension, fever
- Hold anticholinergics/antidiarrheals
- Track rectal blood loss, Hgb
- Low-residue diet in flares
- Biologics (infliximab)
- Metronidazole/cipro for fistulas
- 5-ASA (mesalamine) first-line
- Biologics (infliximab)
- ★Surgery is palliative, NOT curative
- Disease recurs at the anastomosis
- ★Colectomy is curative
- Annual colonoscopy after 8–10 years
- Fistula, abscess, or bowel obstruction
- Toxic megacolon: distension + fever
- Severe hemorrhage
- Fistulas, strictures then obstruction
- Oxalate stones, gallstones
- Malabsorption
- Toxic megacolon, severe hemorrhage
- Colorectal cancer risk ↑
- Primary sclerosing cholangitis
Crohn's Disease
- Transmural — full bowel-wall thickness
- Mouth to anus
- Skip lesions, terminal ileum
Ulcerative Colitis
- Continuous inflammation, no skip areas
- Rectum & colon only
- Mucosal/submucosal
Crohn's Disease
- Semi-formed non-bloody stool
- RLQ pain
- Steatorrhea, weight loss, malabsorption
Ulcerative Colitis
- ★Bloody diarrhea with mucus
- 10–20 stools/day
- LLQ cramping, tenesmus
Crohn's Disease
- ★Cobblestone mucosa on endoscopy
- Deep linear ulcers, skip pattern
Ulcerative Colitis
- Pseudopolyps, friable mucosa
- Continuous erythema from rectum
Crohn's Disease
- Monitor malabsorption, weight loss
- Replace B12 (ileal disease)
- Low-residue diet in flares
Ulcerative Colitis
- Watch toxic megacolon: distension, fever
- Hold anticholinergics/antidiarrheals
- Track rectal blood loss, Hgb
- Low-residue diet in flares
Crohn's Disease
- Biologics (infliximab)
- Metronidazole/cipro for fistulas
Ulcerative Colitis
- 5-ASA (mesalamine) first-line
- Biologics (infliximab)
Crohn's Disease
- ★Surgery is palliative, NOT curative
- Disease recurs at the anastomosis
Ulcerative Colitis
- ★Colectomy is curative
- Annual colonoscopy after 8–10 years
Crohn's Disease
- Fistula, abscess, or bowel obstruction
Ulcerative Colitis
- Toxic megacolon: distension + fever
- Severe hemorrhage
Crohn's Disease
- Fistulas, strictures then obstruction
- Oxalate stones, gallstones
- Malabsorption
Ulcerative Colitis
- Toxic megacolon, severe hemorrhage
- Colorectal cancer risk ↑
- Primary sclerosing cholangitis
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Crohn's CROWDs the whole tract with fistulas; UC is Uniformly Continuous, bloody, and Curable by colectomy.
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Go further
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- TopicUlcerative ColitisA patient passes 15-20 bloody, mucus-laden stools per day yet has no perianal fistulas — that single detail changes the entire care plan and tells you which inflammatory bowel…
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