New or changing symptoms often mean that additional treatment is needed. People who have Crohn's disease should be in frequent contact with a doctor.
One serious complication is bowel obstruction. This occurs when the intestine becomes so narrowed that the digestive contents cannot pass through. Bowel obstruction causes vomiting or severe abdominal pain. It requires emergency treatment.
Other symptoms that require a doctor's immediate attention are:
Fever, which could indicate infection
Heavy bleeding from the rectum
Black, paste-like stools