Itchy anus and something probing, can be considered to have pinworms, hemorrhoids or rectal polyps and other diseases. 1. Pinworms: common in early childhood, parasitic disease caused by pinworms parasitizing the end of the small intestine, cecum, colon, can cause intense itching of the perianal and perineal skin as well as sleep disturbances, in the night time after sleep, can be in the anus skin folds of the small white nematodes probing. 2. Hemorrhoids: If external hemorrhoids occur, there can be anal discomfort, dampness and uncleanliness, local moisture stimulation of the perianal skin, causing itching, can be seen in the perianal connective tissue external hemorrhoids that is the appearance of dermatomes, when accompanied by the internal hemorrhoids prolapse, the nucleus of the hemorrhoids can be seen. 3. Rectal polyps: when the formation of low rectal polyps, can be in defecation polyp prolapse outside the anus, presenting bright red cherry, repeated prolapse of perianal mucus increased, causing anal itching. It is recommended to find anal itching when something to explore timely medical care, after a clear diagnosis, give targeted treatment.