Crohn's disease cannot be accurately diagnosed through a CT scan of the small intestine; it only shows a general overview of the condition. To accurately diagnose specific conditions of Crohn's disease, it is necessary to perform a colonoscopy, combined with blood tests, routine stool tests, and pathological examinations for a definitive diagnosis. Then, further diagnoses can be made based on individual clinical symptoms. This disease generally has a definite connection with genetic and immune factors. If the condition is severe, surgery may be considered to remove the affected intestines.