Crohn's disease is a chronic inflammatory condition that primarily affects the digestive tract. It can cause symptoms like abdominal pain, diarrhea, fatigue, and weight loss. The inflammation can occur anywhere from the mouth to the anus, but it most commonly affects the ileum, which is the last part of the small intestine. This condition can be unpredictable, with periods of flare-ups followed by times of remission. While the exact cause of Crohn's disease is not fully understood, it is believed to involve a combination of genetic, environmental, and immune system factors. Treatment often includes medications, dietary changes, and sometimes surgery.