Anal itching can be caused by allergic reactions, hemorrhoids, and other medical conditions. But most causes are not serious. Spicy foods, citrus fruit, caffeine, and alcohol can irritate the anal area and cause itching. Not cleaning the anal area well—or cleaning it too well by rubbing hard—also can cause itching. Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse call line if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Anal Itching - Digestive Disorders - MSD Manual Consumer Version
Enlarged hemorrhoids cause the leakage of moisture, stool, and fungus. Repeated wiping, cleaning, scratching, and the use of harsh cleaners make the itching worse. It is frequently worse at night. There are many other possible causes of rectal itching.
Anal Itching: Care Instructions
Pruritus ani is a common condition with many causes, predominately anorectal pathology. There are some new insights and therapies, but the most recommendations are based on low-level evidence. A review of the evidence is presented and a management plan based on the elimination of irritants and scratching, general control measures and active treatment measures is offered.