Anal itching with the appearance of blood stains is mainly caused by lesions in the anal as well as rectal area. The causes of this mainly include hemorrhoids, perianal abscess, rectal prolapse. First, the most common is caused by hemorrhoids, hemorrhoids will cause edema around the anus, easy to form the perianal venous blood clusters, thus triggering itching and pain symptoms, especially in the defecation is easy to cause bleeding in the stool. Secondly, it is considered to be caused by rectal prolapse, due to the stimulation of feces and bacteria, the mucous membrane of the lower part of the rectum has lesions, triggering the inflammation of the lower part of the rectum, resulting in the prolapse from the anus, the prolapsed mucous membrane of the rectum will cause difficulties in defecation, which will lead to the occurrence of bleeding symptoms. Third, consider the perianal abscess caused by a variety of reasons caused by the mucous membrane of the lower rectum acute inflammatory reaction, resulting in intestinal tissue fluid from the anus, and the formation of abscesses around the anus, stimulate the skin around the anus caused by itching symptoms, and will cause blood in the stool when defecating.