A day without drinking water on the anal itch is mostly due to primary anal itching, part of the perianal diseases secondary causes. 1. Primary anal itching is a class of unexplained pruritus, perianal skin is generally not broken, manifested as intense itching around the anus, 40% -70% of the itching symptoms belong to the primary anal itching, due to the cause of the unknown, can only be given symptomatic treatment, such as topical application of hydrocortisone cream, tretinoin econazole cream and other treatments to alleviate the pain of itching. 2. Secondary anal itching, before the appearance of itching symptoms, usually have a clear perianal disease, such as anal fistula, perianal eczema, warts, neurodermatitis, etc., through the treatment of the primary disease, itching symptoms will gradually improve, or even disappear. When encountering anal itching symptoms, the need for timely consultation, clear diagnosis, early treatment, so as not to delay the condition, in the treatment of the same time need to maintain perianal cleanliness and hygiene, wear loose cotton underwear, to avoid friction of the skin around the anus, avoid spicy and stimulating food, and so on. The above medication should be used under the guidance of a doctor.