Crohn’s disease is an enduring ailment that has the potential to impact various segments of the digestive system. However, it is predominantly found in the small intestine and the initial section of the large intestine. According to research, over 500,000 individuals in the United States are afflicted by this condition, making it a prevalent health concern in the country. Interestingly, the prevalence of Crohn’s disease is significantly higher in the United States compared to other regions across the globe.
The Lower GI Tract in Crohn’s Disease
Crohn’s disease commonly affects the lower gastrointestinal (GI) tract, particularly the terminal ileum and the colon. In fact, approximately 50 percent of patients with Crohn’s disease experience inflammation in the terminal ileum, which is the final segment of the small intestine, as well as in the colon. For about 30 percent of people with Crohn’s disease, the inflammation is limited to the bowel. On the other hand, around 20 percent of individuals diagnosed with Crohn’s disease have the inflammation confined solely to the terminal ileum.
The Prevalence of Upper Gastrointestinal Crohn’s Disease
Upper gastrointestinal Crohn’s disease is not a common occurrence and is typically found in only 0.3 to 5% of adults. However, it is possible that the actual prevalence could be higher as routine endoscopy to detect involvement in the upper gastrointestinal tract is not commonly performed. This type of Crohn’s disease is more frequently seen in adolescents, with approximately 28% of teenagers diagnosed with Crohn’s disease experiencing upper GI involvement. The most commonly affected areas in the upper GI tract are the stomach, often in combination with the duodenum, which is the first part of the small intestine. On the other hand, esophageal Crohn’s disease is extremely rare, and there is limited available information regarding this particular subtype of the disease.