Anal itch feeling something crawling, including several reasons: 1, first, due to the abnormal secretion of the anal glands, resulting in perianal moisture caused by. Secondly, it may be inflammation of the rectum, after the mucous membrane is stimulated by inflammation, the glands will be abnormal secretion, the secretion of the glands will naturally flow to the outside of the body, distributed in the perianal area to cause localized itchy feeling. In addition, may also be hemorrhoids, especially internal hemorrhoids caused by stimulation of mucosal secretion of glands will increase, you can carry out anoscopy of the examination can be determined. Finally, it may be occupational lesions of the rectum, such as polyps, mucosal prolapse, or even rectal cancer, may cause increased secretion of stimulating glands, which may cause a serious reaction, and need to undergo colonoscopy to determine. 2, some of the parasites will be parasitized in this part of the human body, and in the active worms will cause local itchy sensation of the skin, and can even be found in the appearance of the worm.