Occasional anal itching may be triggered by irritation of the perianal skin due to insufficient local cleaning. If there are persistent anal itching symptoms, you need to consider hemorrhoids, anal eczema, parasitic diseases, etc. An enlarged hemorrhoid nucleus or prolapsed internal hemorrhoid can persistently irritate the perianal skin and may trigger anal itching symptoms. Anal eczema is mainly caused by excessive leakage of rectal secretions or long-term dampness of the perianal skin, and its symptoms are thickened anal skin, dark red color, pigmentation, rough surface and strong itching. Parasitic diseases, due to parasitic worms, such as pinworms, are active in the rectal canal, and when they travel to the anus, they can cause itching by stimulating the perianal skin. In addition, in patients with allergies, when contact with allergens causes generalized itching, it may also spread to the anal area and cause anal itching.