Final answer:
Crohn's disease is a chronic autoimmune disease that commonly affects the ileum of the gastrointestinal tract.
Step-by-step explanation:
Crohn's disease is a chronic autoimmune disease that can affect any part of the gastrointestinal tract, but most commonly occurs in the ileum, which is the final part of the small intestine.
Signs and symptoms of Crohn's disease include abdominal pain, diarrhea, fever, and weight loss. The disease can lead to complications like bowel obstructions and abscesses.
Although there is a slight reduction in life expectancy for people with Crohn's disease, with proper management, they can live full and productive lives.