The common causes of anal itching are: 1, hemorrhoids, which can cause anal itching discomfort, can be accompanied by pain, bleeding, including internal, external and mixed hemorrhoids. 2, one of the symptoms of anal fistula is anal itching, the attack can be accompanied by pain, pus. 3, anal canal proctitis, often accompanied by secretion outflow, which stimulates the perianal skin itching discomfort, and accompanied by stool irregularity, anal swelling discomfort. 4, perianal eczema. The main symptom is anal itching, accompanied by perianal skin lesions, such as rashes, scales. 5, rectal polyps, can cause rectal secretion flow to stimulate anal skin itching, often accompanied by blood in the stool. 6, anal papilloma, can cause secretion flow to stimulate anal skin itching, may be accompanied by swelling out of the anus. 7, a small number of perianal acral warts, can also appear anal itching.