There are many diseases that cause perianal itching, including mixed hemorrhoids, anal fistula, rectal inflammation, sinusitis, perianal eczema, neurodermatitis, infections caused by bacteria, mold or parasites (pinworms), kidney failure, diabetes, etc. Poor hygiene, buttocks often in a warm and humid environment, underwear not dried, dietary intolerance and psychosomatic factors may also be the cause of perianal itching. The anal itch is characterized by intense and long-lasting itching, especially at night or in a humid environment, which seriously affects the normal life of patients. When the itching is severe, the local skin of the anus may also show scratches, blood scabs, pigmentation, mossy sclerosis and even secondary infection due to scratching. ”Perianal itching is triggered by damage to the skin nerve endings, so although the patient has unbearable itching at the anus, the naked eye can’t see any abnormalities. Patients should visit a hospital, and it is recommended that they first consult an anal surgeon.” Therefore, patients must seek medical attention in time after discovering the condition, cooperate with the doctor to do local and systemic examinations, through the doctor’s naked eye, anal finger examination, anoscopy, and, if necessary, examinations about parasitology, and never blindly use medication without understanding the situation. Anal sinusitis, or inflammation of the anal canal and rectum can lead to increased intestinal secretions, and if the anus is not closed properly, the secretions leak out of the anus, leading to perianal eczema and perianal itching. In this case, the enema can be retained with 50 ml of metronidazole injection daily. Poor results of medication can be tried with anal sinusotomy. As far as perianal skin diseases are concerned, perianal eczema, neurodermatitis, ringworm, various warts, venereal diseases, sweat glanditis and other skin diseases can cause anal itching, the most common of which is perianal eczema. Perianal eczema mainly manifests itself as skin damage such as papules, blisters, or even vesicles and oozing in a circle around the anus, often causing thickening and mossiness of the skin around the anus due to intense itching and scratching, with the appearance mostly turning grayish white. “Most commonly, patients suffer from eczema caused by intestinal mucus or a small amount of fecal matter spilling onto the perianal skin, which is not scrubbed in time, and the resulting irritation of the perianal skin.” If the perianal skin itching is caused by fungus, it is necessary to take off skin debris to find fungal spores under the microscope, and after the diagnosis is confirmed, local application of antifungal drugs can be taken, and in severe cases or combined with other parts of the fungal infection, intravenous systemic drugs can be used at the same time. If you have a history of unclean sexual intercourse, you must go to the dermatology department of a regular hospital, because sexually transmitted diseases such as condyloma acuminata and AIDS can also cause perianal and vulvar itching, so you must not delay diagnosis and treatment. Perianal itching may also be a sign of kidney failure and cancer In addition, anorectal diseases such as hemorrhoids, anal fissures, anal fistula, anal sinusitis, anal papillitis, rectal prolapse, anal incontinence, etc., lead to increased secretions from the anal opening and moist irritation of the skin thus causing itching. There is an important reason why perianal itching should not be underestimated, that is, chronic kidney disease, renal failure, abnormal liver function, diabetes, gout and other systemic diseases can cause anal itching, as well as in recent years it was found that in people over 60 years old, one of the initial symptoms of some anal canal and perianal malignant tumors is perianal itching. If the perianal skin or spot marks are hardened or ulcers are formed with itching, or even bleeding, pain and discharge, the possibility of cancer should be alerted. Of course, the final diagnosis of perianal tumor has to be made at the hospital by a specialist for anal finger examination and pathological biopsy. Preventing perianal itch from daily details Perianal itch can be extremely itchy when it strikes. When patients work during the day, their attention is distracted and they do not notice the itch, but at night when it is quiet, the itch is especially obvious and many patients wake up from sleep with itch and cannot sleep at night. The director of Shi Zhang Shi reminded this, the summer weather is hot, the public to prevent perianal itching to pay attention to the daily details. 1, usually keep the anus dry and clean, after each bowel movement is best to scrub the anus with water. And as far as possible every night to clean the anus. It is advisable to use warm water to clean the perianal area. The actual fact is that you will not need to use soap, especially not alkaline soap. The towels and basins used for cleaning should be dedicated to each other to avoid cross-infection. 2, underwear to choose breathable and loose material, and to wash and change, in the sun to sterilize. Itchy people do not wear tight, too hard pants. 3, do not sit for a long time on hot days, especially those who wear jeans should pay attention. It is recommended to stand up and pat your buttocks for an hour or two of work to relax. 4, eat more vegetables and fruits, do not eat or eat less stimulating food, such as chili, strong tea, coffee, high alcohol, etc.. Allergic people should eat less allergy-prone food, such as fish, shrimp, etc., and avoid contact with chemicals that cause allergies. 5, to actively treat those diseases that can cause anal itching, such as diabetes, chronic kidney disease, abnormal liver function, etc. 6, pay attention to the combination of work and rest, keep a happy mood, prevent excessive tension and anxiety, do not scratch the anus, do not use too hard objects to rub the anus.