Patients with decades of chronic colitis who have a family history of cancer (especially bowel cancer), poor basic condition, lesions involving the whole colon, recurrent episodes, and poor day-to-day management have a relatively higher risk of cancer. 1. Patients with more than 10 years of colitis who have no family history of cancer, good physical condition, lesions that do not involve the colorectum, and good dietary and living habits have a relatively lower risk of cancer even if the disease has a long course. 2. If a patient with more than ten years of colitis has a family history of cancer (especially intestinal cancer), the lesion involves the whole colon, has recurrent attacks, and usually does not pay attention to the daily manager, the basic condition is poor, then the risk of cancer will be relatively higher. In summary, although chronic enteritis has a course of several decades, there is still some variation in the specific risk of cancer. It is recommended that people with a longer course of chronic enteritis must standardize their interventions and undergo regular review under the guidance of their doctors to minimize the risk of cancer in order to prolong life and improve the quality of life.