Crohn’s disease is a long-term chronic inflammatory bowel disease that can affect any part of the gastrointestinal tract. Early warning signs of Crohn’s disease may include abdominal pain, weight loss, fever, fatigue, and diarrhea. Other less common signs may include rectal bleeding, joint pain, anemia, night sweats, and mouth sores. It is important to see a doctor as soon as possible if you experience any of these symptoms to ensure an accurate diagnosis and to begin treatment.