Crohn's Disease Flare Characteristics and Management

Core Gastrointestinal Manifestations

• Diarrhea is the hallmark symptom, with severe flares producing at least 10 loose stools per day, though milder exacerbations may present with fewer bowel movements 1
• Abdominal pain occurs daily during moderate to severe flares, typically colicky in nature and reflecting active intestinal inflammation 1, 2
• Weight loss develops from both malabsorption and reduced oral intake, serving as a key indicator of disease severity 1, 3

Systemic Symptoms

• Fever is more common in Crohn's flares than ulcerative colitis and helps distinguish between the two conditions 1, 2
• Malaise and anorexia are systemic features that differentiate Crohn's exacerbations from other inflammatory bowel conditions 1, 2

Laboratory Abnormalities

• Elevated C-reactive protein (CRP) reflects the inflammatory burden during active disease 1, 4
• Low serum albumin indicates both inflammation and poor nutritional status 1, 4
• Elevated fecal calprotectin serves as a noninvasive marker of intestinal inflammation 3, 5

Disease Severity Classification

• The Crohn's Disease Activity Index (CDAI) provides objective severity assessment, with moderate disease defined as CDAI 220-450 and severe disease defined as CDAI >450 1, 6
• The Harvey-Bradshaw Index (HBI) offers a simpler clinical assessment using general well-being, abdominal pain, liquid stool frequency, abdominal mass, and extraintestinal manifestations 6

Monitoring Strategy

• Objective measures of inflammation, such as endoscopic assessment, cross-sectional imaging, and biomarkers (CRP, fecal calprotectin), should be obtained when assessing for a flare 4, 5, 6, 7
• The absence of ulcerations on endoscopy defines endoscopic remission, which predicts better long-term outcomes than symptomatic improvement alone 4