Do not be nervous about the occurrence of a lot of blood in the anus. First, it should be analyzed for its cause, should ask whether there is a history of foreign body invasion such as knife stab wounds, or sharp instruments that can easily damage the anus and rectum thus causing bleeding, through the anal visual examination can be clearly diagnosed. Second, if the patient had hemorrhoids in the past, long-term constipation or sudden consumption of a large amount of stimulating food, a large amount of alcohol can lead to the rupture of the hemorrhoid nucleus and cause blood in the stool, the blood in the stool is bright red, the amount of blood in the stool is usually very large, rectal diagnosis and placement of anoscopy can be clearly diagnosed. Third, if a large amount of blood in the stool suddenly appears, there may be other intestinal lesions such as rectal polyps, rectal adenomas and colon and rectal malignant tumors, if you suspect such lesions, you should promptly perform colonoscopy.