Inflammatory Bowel Disease: Symptoms, Early Diagnosis, and Differences Between Crohn's and Ulcerative Colitis

Inflammatory Bowel Diseases (IBD) are increasingly in the spotlight, especially during campaigns like Purple May, which seek to raise awareness about the importance of early diagnosis and specialized monitoring.

Among IBD, Crohn's Disease and Ulcerative Colitis stand out, chronic conditions that significantly impact quality of life and require attention from both patients and healthcare professionals.

Early diagnosis of IBD is crucial to avoid complications and improve prognosis. Key warning symptoms to watch for include:

• Persistent diarrhea, often with blood

• Recurrent abdominal pain

• Unintentional weight loss

• Rectal bleeding

• Emergency evacuation

• Fever and fatigue

These symptoms, especially when they persist for more than four weeks, should not be ignored. Blood in the stool, unexplained weight loss, and frequent abdominal pain are signs that something more serious may be happening in the gastrointestinal tract.

Not all abdominal pain or changes in bowel habits indicate IBD, but there are signs that warrant immediate investigation:

• Bloody diarrhea

• Recurrent abdominal pain

• Unintentional weight loss

• Persistent fever

• Intense fatigue

These symptoms may indicate active intestinal inflammation and, when present, warrant a detailed evaluation with a gastroenterologist.

Crohn's disease can present extraintestinal manifestations, such as lesions on the skin, joints and eyes, while Ulcerative Colitis tends to be limited to the large intestine, but can present serious complications such as toxic megacolon and an increased risk of colorectal cancer.

Crohn's disease can affect any part of the gastrointestinal tract, from the mouth to the anus, although it is most common in the terminal ileum and colon. Ulcerative colitis, on the other hand, is restricted to the large intestine (colon) and rectum.

In Crohn's disease, lesions are typically discontinuous, meaning they may appear in alternating areas with healthy segments of the intestine, forming the so-called “stir-fried” pattern.

In Ulcerative Colitis, the lesions are continuous, always starting in the rectum and may extend uniformly throughout the colon.

Inflammation in Crohn's disease is transmural, affecting all layers of the intestinal wall. In contrast, in ulcerative colitis, inflammation is restricted to the mucosa, the innermost layer of the intestine.

Crohn's disease can cause narrowings (strictures), fistulas, and abscesses due to deep inflammation. Ulcerative colitis, on the other hand, affects only the mucosa, and its most common complications include intestinal bleeding and the risk of toxic megacolon.

It is essential to see a gastroenterologist if you experience persistent symptoms, especially if:

• Symptoms last more than four weeks

• There is presence of blood in the stool

• The patient presents with unexplained weight loss

• There is a family history of serious gastrointestinal diseases

The specialist will request essential tests for diagnosis, such as:

• Colonoscopy: allows direct visualization of the intestinal mucosa and collection of biopsies

• Fecal calprotectin: a marker of intestinal inflammation, useful for differentiating IBD from other causes of diarrhea

• Laboratory tests to assess anemia, inflammation, and possible nutritional deficiencies.

Early detection is crucial to avoid complications such as strictures, fistulas, abscesses and, in more severe cases, the need for surgery.

Differentiating IBD from other gastrointestinal conditions is a significant clinical challenge. Irritable Bowel Syndrome (IBS) is a leading cause of similar symptoms, but it has distinct characteristics:

• In IBS, symptoms are intermittent and there is no detectable inflammation or structural damage to the intestine.

• There are no warning signs such as rectal bleeding, weight loss, or anemia.

• The diagnosis of IBS is clinical, based on specific criteria (Rome criteria), and the presence of alarm symptoms indicates investigation for IBD or other diseases.

Other conditions that can mimic IBD include:

• Food allergies

• Intestinal infections (giardiasis, infectious colitis)

• Microscopic colitis

• Celiac disease

• Parasitic diseases

Performing additional tests, such as colonoscopy, parasitological exams and food intolerance tests, helps to exclude these causes and confirm the diagnosis of IBD.

Early diagnosis of Inflammatory Bowel Disease is crucial to avoid complications and ensure a better quality of life. Be aware of persistent symptoms, such as bloody diarrhea, recurring abdominal pain, and unintentional weight loss. If you identify these signs, consult a gastroenterologist for a detailed evaluation and specific tests.

Differentiating IBD from other conditions, such as irritable bowel syndrome and food allergies, is essential for proper treatment. A balanced diet and maintaining a healthy gut microbiome are also important allies in preventing and controlling these diseases.

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