Colon congestion after colonoscopy generally refers to colonoscopy shows that the colon is congested, indicating that it may suffer from inflammatory bowel disease, infectious enteritis and other diseases caused by the need to use medication under the guidance of a doctor, such as luzosulfapyridine, methotrexate, levofloxacin and so on. 1. Inflammatory bowel disease: patients with mild to moderate ulcerative colitis can be treated with Liuzosulfapyridine, glucocorticosteroids such as prednisone can be used to treat patients with moderately severe inflammatory bowel disease during the active phase of the disease, and immunosuppressant treatments such as methotrexate, azathioprine, etc. can also be used. 2. Infectious enteritis: bacterial infection can be caused by the use of antibiotics such as levofloxacin, viral infections generally do not need to use antiviral drugs, with severe diarrhea can be used to stop diarrhea, with dehydration symptoms can be considered rehydration therapy, to avoid the emergence of serious electrolyte and water disorders. If colonoscopy shows congestion of the large intestine, it is recommended to go to the hospital and ask the doctor to make a judgment and formulate an individualized treatment plan.