Rectal cancer is often detected through rectal fingerprinting, colonoscopy and pathologic biopsy for initial screening as well as confirming the diagnosis. 1. Rectal finger test: usually the doctor puts on gloves and inserts the lubricated finger into the patient’s anus to check the anus and low rectal diseases, which is usually used to screen low rectal cancer. 2. Enteroscopy: enteroscopy can directly observe the intestinal tissues, and biopsy can be performed under the microscope to clarify the nature of lesions. 3. Pathological biopsy: if a mass or foreign body is seen in colonoscopy, pathological biopsy can be performed on it, which is the gold standard. Risk factors of rectal cancer include heredity, diet, work and rest habits, etc. It is recommended to avoid overworking and staying up late in life, and take light diet and avoid spicy and stimulating food. If there is a need for rectal cancer examination, it is recommended to go to the hospital for examination under the guidance of doctors.