大肠癌早期症状常不明显，往往造成误诊。选择正确的检查方法是关键所在。临床上，结肠病变的检查方法有直肠指检、大便潜血试验、乙状结肠镜检查、钡灌肠、气钡灌肠、结肠镜及血清癌胚抗原(CEA)检查等，但临床应用中都有其局限性。惟有结肠镜才是大肠器质性病变最敏感的检查方 Early symptoms of colorectal cancer are often not obvious, often resulting in misdiagnosis. Choosing the right inspection method is the key. Clinically, colon lesions are examined by digital rectal examination, fecal occult blood test, sigmoidoscopy, barium enema, stasis enema, colonoscopy, and serum carcinoembryonic antigen (CEA) examination, but have limitations in clinical applications. . Only colonoscopy is the most sensitive checker for organic lesions of the large intestine