To evaluate the safety and effectiveness of ENDOANGEL Lower Gastrointestinal Endoscope Image Auxiliary Diagnostic Software developed and manufactured by Wuhan ENDOANGEL Medical Technology Co., Ltd.

Inclusion Criteria:

• 18 years old ≤ age ≤ 75 years old, male or female;
• Subjects with colonoscopy diagnosis and screening needs;
• Sign the Written Informed Consent Form;
• With full capacity for civil conduct.

Exclusion Criteria:

• History of acute myocardial infarction (within 6 months), severe heart, liver, and renal insufficiency or mental disease;
• Patients who are taking aspirin, warfarin, and other anticoagulants;
• Patients with inflammatory bowel disease, or polyposis syndromes, or confirmed or highly suspected colon cancer;
• History of colorectal surgery;
• Patients with familial adenomatous polyposis;
• Pregnant women (if the subject is a woman of reproductive age and cannot confirm whether she is pregnant, a pregnancy test is required);
• Patients who are participating in clinical trials of other drugs or medical devices;
• Patients who are not eligible to participate in this clinical trial in the opinion of the investigator.