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This book describes Pruritis (Itchy) Anus, Diagnosis and Treatment and Related DiseasesPruritis anus or pruritis ani is a term meaning “itchy anus” and is described as an unpleasant sensation of the skin around the anus (i.e., rectal opening) that induces the desire to scratch. This is the sense of constant perianal itching, producing a desire to scratch the anus. It is a symptom and NOT a diagnosis.Pruritis ani can be classified as primary or secondary. 1.The primary form is the classical syndrome which may have an unknown cause (idiopathic) 2.The secondary form has an identifiable, and often often treatable, cause.The slightest stimulation of the skin may cause itching. The resultant scratching may cause injury to the skin which produces a bigger area of irritated skin. Persistent scratching induces the need to scratch more, making the problem worse.Anal itching happens when the skin around the anus becomes irritated by some agent. The person may feel an intensive itch around and just inside the anus.The discomfort of the skin around the anus, inducing an absolute need to have to scratch, can have many causes. The region around the anus is hot and humid. Indeed, there is no ventilation around this area. There may be excessive sweating, which stimulate the irritating environment. Finally, a micro-organism infection may form around the anus.Pruritis ani is a frequent medical problem involving children, men and womenPruritis ani most often involves adults, affecting from 1% to 5% of people in the general population. Men are more often affected than women with a 4:1 ratio. The disorder is most frequent in people age 40s to 60s.CausesAnal itching may be caused by:1.Spicy foods, caffeine, alcohol, and other irritating foods and beverages2.Scents or dyes in toilet paper or soap3.Diarrhea4.Hemorrhoids, which are swolle