Anal itching belongs to a type of perianal disease, the causes of anal itching include: 1, health reasons: after stool cleaning is not clean, long time without bathing this situation, not clean hygiene this can cause itching; 2, anal problems: anal infection, including bacterial infection, fungal infection, and some viral infections, can also occur; 3, parasitic diseases: such as hookworm, Filariasis, may occur in the anus itching; 4, other: ulceration, or scratching, or mosquito bites, there are other insects, including insect, other insect bites, can cause itching or allergic conditions.