The anal sinus is located at the junction of the rectum and the anal canal, with the opening upward and the lower end connected to the anal glands. The sinuses secrete fluid, which lubricates the anal canal, facilitates defecation, and protects the anal canal. If the anal sinus accumulates feces or is blocked by secretions, it causes inflammation, namely anal sinusitis. 1, symptoms: anal sinusitis, also known as anal cryptitis, because in the anal canal within the part, the symptoms are relatively light, often ignored by doctors and patients. In fact, anal sinusitis is a potential focal point of original infection for many anal diseases. Clinical studies have shown that about 85% of anorectal lesions are associated with sinusitis. For example, submucosal abscesses of the rectum, perianal abscesses, anal fistulas, anal fissures, and enlarged anal papillae, the original lesion is sinusitis. There are acute and chronic sinusitis, and chronic sinusitis can have no obvious symptoms. The most important thing is to have a good understanding of the situation. In the acute stage, there may be more obvious burning pain and swelling in the anus, and there may be more discharge from the anal opening. If the anal sphincter is spasmodically contracted reflexively after inflammatory stimulation, there will be prolonged persistent pain and paroxysmal dull pain. During clinical examination, the anal saphenous fossa is seen to be congested and edematous under the anoscope, and sometimes even tears, erosions and ulcers are seen, the depression of the anal saphenous fossa deepens, and there are mucus, pus or blood and other secretions, mostly accompanied by hypertrophic redness of the anal papilla. 2, treatment: the treatment and prevention of anal sinusitis, including the formation of good habits of regular defecation, to prevent diarrhea and constipation. To get rid of the causative factors. Patients can take oral Pefikon, which is a triple-activated bacterial preparation. It mainly contains probiotics such as Bifidobacterium, Lactobacillus acidophilus and Enterococcus. The main role is to prevent and treat diarrhea, but at the same time can improve constipation. It has a two-way regulation effect. Topical treatment can be done by taking a sitz bath with warm water at 40℃ for 15-20 minutes after stool. The treatment can be done by taking a sitz bath for 15-20 minutes after stool with warm water at 40°C. Or take a sitz bath with a decoction of Chinese herbs to clear heat, dry dampness, detoxify and relieve pain, using 15g of Phellodendron, 20g of Mannicholae, 30g of Ginseng and 15g of Zingiber officinale. Include a metronidazole anal suppository or hemorrhoid suppository, once in the morning and once in the evening. For patients with rapid onset and severe symptoms, enema with Chinese herbs can be added to clear heat, dry dampness and relieve pain. 15g of Rhubarb, 15g of Phellodendron, 15g of Huanglian, 20-30ml of water decoction can be used for enema, once in the morning and once in the evening. In severe cases, antibiotics can be used for 5-7 days, such as oral cefaclor (Ciclosporin) 0.25g, 3 times a day. Traditional anal sinus incision and drainage is suitable for those who have septic lesions or hidden anal fistulas in anal sinusitis. 3, prevention: prevention of anal sinusitis in addition to a good habit of regular bowel movements every day, often cleaning the anus, but also in the diet avoid spicy stimulating food, do not drink alcohol, eat more fresh vegetables and fruits, supplemented with sufficient water. Maintain normal and regular bowel movements. At the same time, avoid excessive fatigue, appropriate exercise to enhance the body’s immune function and resistance to disease, but also long-term use of bifidobacterium triptans capsules Pepcid, which can maintain the dominant flora of the human intestinal tract, with nutritional and immunomodulatory functions. A lot of clinical practice tells us that both doctors and patients can not ignore or take lightly although not very serious but harmful anal sinusitis, because anal sinusitis is the birthplace of many anal diseases.