Crohn's Disease
Crohn’s disease — named after the American gastroenterologist Burrill Bernard Crohn, who first described it — is a chronic inflammatory bowel disease (IBD) affecting the gastrointestinal tract.
The condition typically begins in young adulthood and tends to worsen over time. Its main symptoms include abdominal pain, diarrhea, and weight loss, often with a significant impact on quality of life.
Although there is no definitive cure, symptoms can be effectively managed through medications, dietary adjustments, and, when necessary, surgical intervention.
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On this page
- What Is Crohn's Disease?
- What Are the Symptoms of Crohn's Disease?
- How Do You Diagnose Crohn's Disease?
- How Do You Treat Crohn's Disease?
What Is Crohn's Disease?
Crohn’s disease is a serious chronic inflammatory bowel disease (IBD) that can affect the entire digestive tract, from the mouth to the anus. It most commonly involves the final part of the small intestine (the ileum).
The exact causes are not fully understood. The most widely accepted theory suggests a multifactorial origin: genetic predisposition, an abnormal immune response to intestinal bacteria, and environmental factors all play a role.
If not properly treated, the disease can lead to intestinal ulcers and serious complications such as fistulas and strictures, which may sometimes require surgery.
Types of Crohn’s Disease
There are five types of Crohn’s disease, classified according to the location of inflammation:
- Crohn’s (granulomatous) colitis: affects the colon (large intestine).
- Ileitis: affects only the ileum, the final and longest part of the small intestine.
- Ileocolitis: the most common form, affecting both the ileum and the colon.
- Gastroduodenal Crohn’s disease: involves the stomach and the duodenum (the first part of the small intestine).
- Jejunoileitis: affects the jejunum (the upper half of the small intestine).
Causes of Crohn’s Disease
The exact origin of Crohn’s disease has not yet been fully clarified. According to the most accepted theory, it results from a dysregulated immune response that leads to chronic intestinal inflammation.
Possible contributing factors include:
- Alterations in the intestinal microbiota.
- Environmental factors (such as smoking, caffeine, and certain foods).
- Genetics and family history.
The Role of Stress in Crohn’s Disease
Although stress is not a direct cause of Crohn’s disease, prolonged periods of psychological stress can influence its course and make treatment adherence more difficult, ultimately worsening quality of life.
Patients with this condition should pay close attention to stress management and consider psychological support to better control the disease and improve overall well-being.
Complications of Crohn’s Disease
If left untreated, Crohn’s disease can lead to:
- Abscesses.
- Fistulas.
- Inflammation affecting other parts of the body.
- Intestinal obstruction.
- Malnutrition.
- Anal fissures.
- Colon cancer.
- Ulcers.
What Are the Symptoms of Crohn's Disease?
Symptoms of Crohn’s disease vary depending on the part of the intestine affected. The most common include:
- Rectal bleeding.
- Fatigue and weakness.
- Anemia.
- Abscesses.
- Abdominal cramps and pain.
- Chronic diarrhea.
- Joint pain.
- Fever.
- Fistulas.
- Eye inflammation.
- Nausea.
- Significant weight loss.
- Sores or abscesses in the anal area.
- Skin problems.
- Mouth ulcers.
How Do You Diagnose Crohn's Disease?
Diagnosing Crohn’s disease is not always straightforward. The wide range of symptoms and their overlap with other conditions (such as irritable bowel syndrome) can make identification challenging. Early diagnosis is essential to enable timely treatment, reduce complications, and manage the disease while maintaining the best possible quality of life.
The diagnostic process begins with a review of the patient’s medical history, symptom evaluation, and physical examination. Tests used to diagnose and monitor the disease include:
- Blood tests.
- Stool tests.
- Intestinal ultrasound.
- Gastroscopy.
- Ileocolonoscopy.
- Magnetic resonance enterography (MRE).
- CT enterography (CTE).
- Biopsy.
Risk Factors for Crohn’s Disease
Factors that may increase the risk of developing Crohn’s disease include:
- A diet high in saturated fats and refined sugars.
- Smoking.
- Genetic predisposition and family history.
- Long-term use of medications (nonsteroidal anti-inflammatory drugs – NSAIDs – and oral contraceptives).
- Use of antibiotics during childhood (which may alter the intestinal microbiota).
- Age: the disease is more common in young adults, typically between 15 and 35 years, but it can also occur in children.
How Do You Treat Crohn's Disease?
There is currently no definitive cure for Crohn’s disease. However, several treatment options can help reduce and control intestinal inflammation, prevent flare-ups, manage symptoms, and slow disease progression.
Drug Therapy
Commonly used medications include:
- Corticosteroids.
- Immunosuppressants.
- Intestinal antibiotics.
- Biologic drugs (e.g. TNF inhibitors).
- Experimental therapies.
Lifestyle Modifications
Specialists may recommend avoiding foods that trigger symptoms. These vary from person to person but commonly include:
- Dairy products (in case of lactose intolerance).
- Highly spiced foods.
- High-fiber foods.
Regular physical activity can also support disease management.
Surgery for Crohn’s Disease
In most cases, medication helps keep the disease under control. However, surgery may be required in the presence of complications, such as:
- Abdominal abscesses.
- Strictures.
- Fistulas.
Some acute complications, such as intestinal obstruction or perforation, may require emergency surgery.
Surgery is not a definitive cure for Crohn’s disease, as no permanent cure currently exists and recurrence is a characteristic feature of the condition. Surgical procedures aim to treat specific complications. The two main types are:
- Intestinal resection: partial or total removal of a section of the intestine using different techniques (open, laparoscopic, or robotic surgery).
- Strictureplasty: indicated in cases of multiple strictures.
Reviewed May 2026.