From the clinical situation over the years, patients suffering from anorectal diseases have a rising trend, some patients tend to ignore the symptoms previously appeared, delayed again and again, resulting in bad consequences. If you find any of the following conditions, you should go for colonoscopy in time.　 (1) Changes in bowel habits: increased frequency of bowel movements or frequent bowel movements, but no fecal discharge, or constipation. (2) Blood in stool: the color of blood is dark red. (3) Mucus stool: mucus or pus and blood-like fluid in the stool. (4) Changes in stool shape: the stool becomes thin and flat. (5) Abdominal distension and abdominal pain: obstructive abdominal distension and abdominal pain may occur. (6) Diarrhea: unexplained recurrent diarrhea.　 Enteroscopy of anorectal diseases requires some special examinations by anorectal specialists. Here is a brief introduction to a few: (1) proctoscopy: rectal area of the lesion due to the location of further elevation, so the need to do proctoscopy, patients should pay attention to the examination should be done before certain preparations for the examination, at present, the main laxative taken to evacuate the stool or make a cleansing enema to evacuate the stool.　 (2) Sigmoidoscopy: Sigmoidoscopy is needed when the disease site of the intestines rises further, and the points of attention are the same as those of proctoscopy.　 (3) Fiberoptic colonoscopy: basically all the diseases of the large intestine and the anus can be diagnosed by fiberoptic colonoscopy, but attention should be paid to set a good time with the doctor in advance and follow the doctor's instructions to do the more complicated preparations.　 (4) X-ray examination: barium enema can be made to check the anorectal disease, can also be used for imaging and other checks complex anal fistula, need to be completed under the guidance of the doctor.