Itchy anus at night is considered to be a symptom of parasitic worms, commonly found in children, such as winding worm infections, which mostly appear at night with obvious itching discomfort, and thread-like worms can be found by shining a strong flashlight on the anus, requiring oral treatment with worm-killing medication, such as intestinal worm cleaning, and paying attention to hand hygiene, especially before meals and after stools. Anal eczema can also appear itchy and uncomfortable, mostly caused by local stimulation, more common is digestive fluid, due to anal incontinence and other reasons, the anus often flows out of digestive fluid, repeatedly stimulating the formation of eczema, you need to pay attention to local cleanliness, hygiene, treatment of the symptoms of anal incontinence, topical application of furnace glycolic lotion or dinaide cream. External hemorrhoids can also appear anal itching, which is caused by perianal varicose veins, local skin mucosa malnutrition, frequent hot water sitz bath, solve the treatment of constipation, do not sit for a long time, the symptoms will gradually improve. Try to go to the hospital and let the doctor check it out.