Objective 13: Differentiate Between Crohn's Disease and Ulcerative Colitis by Discussing Their Locations in the Gastrointestinal Tract, Patterns of Inflammation, and Clinical Manifestations

Crohn Disease Location

Can affect any portion of the GI tract from the mouth to the anus.

Most Common Crohn Disease Location

The terminal ileum and cecum.

Crohn Disease Age of Diagnosis

Frequently diagnosed between ages 20 and 30.

Crohn Disease Inflammation

Granulomatous, transmural inflammation involving the entire thickness of the intestinal wall.

Crohn Disease Distribution

Patchy inflammation with skip lesions separating diseased areas from normal tissue.

Terminal Ileum

The final portion of the small intestine and a common site of Crohn disease.

Cecum

The first portion of the large intestine and another common site of Crohn disease.

Crohn Disease Manifestations

Chronic diarrhea, abdominal pain, cramping, weight loss, fatigue, and low-grade fever.

Crohn Disease Malabsorption

Impaired nutrient absorption caused by intestinal inflammation and damage.

Crohn Disease Nutritional Complications

Vitamin and mineral deficiencies, protein malnutrition, and fluid and electrolyte imbalances.

Ulcerative Colitis Location

Limited to the colon.

Ulcerative Colitis Starting Location

The rectum; inflammation spreads proximally through the colon.

Ulcerative Colitis Inflammation

Continuous inflammation primarily involving the mucosal and submucosal layers.

Ulcerative Colitis Distribution

Continuous inflammation without skip lesions.

Ulcerative Colitis Pathology

Inflammation begins in intestinal crypts and can cause crypt abscesses, bleeding, necrosis, and superficial ulceration.

Ulcerative Colitis Hallmark Manifestation

Frequent bloody diarrhea containing mucus.

Fecal Urgency

A sudden, strong need to have a bowel movement, commonly associated with ulcerative colitis.

Fecal Incontinence

Inability to control bowel movements, which can occur with ulcerative colitis.

Nocturnal Diarrhea

Diarrhea occurring during the night that can indicate more severe ulcerative colitis.

Mild Ulcerative Colitis

Fewer than four stools daily without signs of systemic toxicity.

Moderate Ulcerative Colitis

More than four stools daily with minimal systemic illness.

Severe Ulcerative Colitis

More than six bloody stools daily with systemic disease, such as fever, anemia, or elevated ESR.

Fulminant Ulcerative Colitis

More than ten bowel movements daily with continuous rectal bleeding.

Crohn Disease Structural Complications

Fibrosis, strictures, fistulas, and abscesses caused by transmural inflammation.

Ulcerative Colitis Structural Complications

Superficial ulceration, pseudopolyps, toxic megacolon, perforation, and increased colorectal cancer risk.

What parts of the GI tract can Crohn disease affect?

Any portion from the mouth to the anus.

Where does Crohn disease most commonly occur?

The terminal ileum and cecum.

At what age is Crohn disease frequently diagnosed?

Between ages 20 and 30.

What type of inflammation characterizes Crohn disease?

Granulomatous, transmural inflammation involving the entire intestinal wall.

What are skip lesions, and which disease causes them?

Patchy areas of diseased bowel separated by normal tissue; characteristic of Crohn disease.

What are common manifestations of Crohn disease?

Chronic diarrhea, abdominal pain, cramping, weight loss, fatigue, and low-grade fever.

Why can Crohn disease cause nutritional deficiencies?

Intestinal inflammation damages the lining and interferes with normal nutrient absorption.

What nutritional complications can occur with Crohn disease?

Vitamin and mineral deficiencies, protein malnutrition, and fluid and electrolyte imbalances.

Which portions of the GI tract are affected by ulcerative colitis?

The colon only.

Where does ulcerative colitis always begin?

In the rectum.

In which direction does ulcerative colitis spread?

Proximally through the colon.

What is the inflammatory pattern of ulcerative colitis?

Continuous inflammation without skip lesions.

Which layers of the bowel are primarily affected by ulcerative colitis?

The mucosa and submucosa.

Where does ulcerative colitis inflammation begin microscopically?

In the intestinal crypts at the base of the colonic mucosa.

What is the hallmark manifestation of ulcerative colitis?

Frequent bloody diarrhea containing mucus.

Why does ulcerative colitis cause bloody stools?

Inflammation and ulceration damage the colonic mucosa and its blood vessels.

Why does ulcerative colitis cause mucus in the stool?

The irritated intestinal lining produces mucus.

What are additional manifestations of ulcerative colitis?

Mild abdominal cramping, fecal urgency, fecal incontinence, weakness, and fatigue.

What can nocturnal diarrhea indicate in ulcerative colitis?

More severe disease.

What characterizes mild ulcerative colitis?

Fewer than four stools per day without systemic toxicity.

What characterizes moderate ulcerative colitis?

More than four stools per day with minimal systemic illness.

What characterizes severe ulcerative colitis?

More than six bloody stools daily with systemic findings such as fever, anemia, or elevated ESR.

What characterizes fulminant ulcerative colitis?

More than ten bowel movements daily with continuous rectal bleeding.

What is the major difference in anatomical distribution between Crohn disease and ulcerative colitis?

Crohn disease can affect anywhere in the GI tract, while ulcerative colitis is limited to the colon.

What is the major difference in inflammatory depth?

Crohn disease is transmural, while ulcerative colitis primarily involves the mucosa and submucosa.

What is the major difference in inflammatory pattern?

Crohn disease has skip lesions, while ulcerative colitis has continuous inflammation.

Which disease is more strongly associated with malabsorption and nutritional deficiencies?

Crohn disease.

Which disease is more strongly associated with bloody diarrhea and mucus?

Ulcerative colitis.

Which disease is more strongly associated with fistulas, strictures, and abscesses?

Crohn disease.

Which disease is more strongly associated with toxic megacolon?

Ulcerative colitis.