Colorectal inflammatory changes are usually defined as inflammatory changes in the mucosa of the colon and rectum and are categorized as acute inflammatory lesions and chronic inflammatory changes. Inflammatory changes are observed enteroscopically as edema, congestion, and may be accompanied by erosions. 1. Acute inflammatory lesions: acute inflammatory lesions are often accompanied by abdominal pain, often in the left lower abdomen. Nausea and vomiting, diarrhea symptoms. 2. Chronic inflammatory changes: slower onset, often accompanied by diarrhea and pus and blood stools and mucus stools. Abdominal pain can be severe or mild. There is also fever, nausea and vomiting, and malnutrition. If patients have adverse symptoms, they should consult a doctor in time to find out the cause of the disease and cooperate with the treatment.