A few common symptoms of Crohn's disease include abdominal pain, constipation, and chronic diarrhea. However, other symptoms are possible, such as weight loss, rectal bleeding, and fever. Symptoms can vary from person to person and also depend on the severity of the disease. Some people experience symptoms only occasionally; others have symptoms on a more regular basis. Crohn's disease symptoms may go away for months, or even years, if the disease goes into remission -- but they usually return at some point. Children with Crohn's disease have slightly different symptoms, which can include a fever of unknown cause and unexplained weight loss, in addition to diarrhea and abdominal pain. More serious symptoms of Crohn's disease include abdominal swelling, a bowel movement that contains mostly blood clots, and unusual fatigue or weakness.