Itching in the anal area at night while sleeping, considering hemorrhoids and anal fissure, perianal eczema, intestinal parasitic infections, the reasons are: first, hemorrhoids, will trigger the anal area to appear lumps, which triggered an increase in secretions around the anus caused by itching. Second, perianal eczema, mainly caused by long-term moisture around the anus, while perianal eczema will cause the skin around the anus pimples and secretions, thus triggering itching symptoms. Third, intestinal parasitic infections, especially pinworm infection will aggravate the degree of itching at night, mainly at night the parasite will crawl out of the anus and in the anus activities and eggs, thus aggravating the degree of itching at night. In addition, perianal inflammation or allergic reactions caused by bacterial or viral infections can also cause this condition.