Anal sinusitis, also known as anal cryptitis, is an inflammatory lesion of the anal crypt in the dentate line of the anus. It is called “dirty poison” in Chinese medicine. It is a common condition of anal infection and is often complicated by anal papillitis. The papillae are enlarged. It is also an important cause of septic disease. Since the anal sinus is like a funnel, the opening is opened upward, and feces and other dirty things can easily accumulate in the sinus, and also be easily broken by hard fecal abrasions. After the invasion of bacteria will cause infection in the anal sinus and spread along the anal gland ducts, so anal sinusitis is also the root cause of many anorectal diseases, such as perianal abscess, anal fistula, anal fissure, hemorrhoids, anal papillitis, anal itching, anal eczema, proctitis, etc. The occurrence of epithelial cancer of the anal canal is also related to the stimulation of chronic anal sinus inflammation, and almost all anal diseases. In particular, perianorectal abscess and anal fistula, which are directly caused by anal sinusitis, can lead to recurrence of anal fistula and non-healing wound, but because the symptoms are mild and easily ignored by patients and doctors, we propose to routinely explore the anal sinus in all anal surgeries and actively treat anal sinusitis. The following points should be noted in the treatment: 1. The insidiousness of anal sinusitis Anal sinusitis has the feeling of urgency in the anus and then heavy The feeling of falling in the anus has the feeling of stool, the feeling of unclean stool. pain , discomfort and hidden pain at the anus, aggravated by defecation, pain can radiate to the buttocks, inner thighs. There may be a small amount of mucus and blood in the stool. The anal papilla may prolapse out of the anus when it is enlarged. However, clinically, the patient’s symptoms are mild or even asymptomatic, but the anal sinus is deepened and painful during finger examination. In particular, perianorectal abscesses and fistulas are caused by sinusitis, but most people do not have symptoms of sinusitis before the onset of the disease, so sinusitis is somewhat insidious. Intraoperative probing can reveal a significant deepening of the anal sinus and an enlarged anal papilla, which can be given treatment. 2, the treatment of anal sinusitis can be warm salt water sitz bath local, so that local clean, but also can use a variety of hemorrhoid plugs and hemorrhoid cream. At the same time, oral antibiotics can be taken to treat the disease caused by diarrhea and other intestinal infections; or the use of laxatives to normalize fecal excretion, due to the anatomical and physiological characteristics of the anal sinus, its sinus mouth upward, the accumulated fecal residue and pus can not be completely discharged, more can not be completely cured, but only to reduce the symptoms. 3, the significance of routine intraoperative exploration of the anal sinus in perianal abscess Probing the internal mouth with the anal sinus probe is more reliable than direct probing from the external mouth, probing from the external mouth may cause false internal mouth, direct probing from the internal mouth can generally find deepened anal sinus, especially from the external mouth to the anal canal under the skin can not be probed, it is difficult to determine the internal mouth, the anal sinus must be probed. And all other anal sinuses should also be explored, and if there is deepening, they should also be cut, otherwise, there is a possibility that the wound will not heal and there may be recurrence. In a clinical case, the wound did not heal for a long time after surgery, and after anesthesia, the deepened anal sinus could be explored next to the internal orifice, which was incised, and then the incised anal sinus could be explored from the wound, and the wound healed quickly after surgery. 4 .The significance of anal fissure The formation of anal fissure is due to the spasm and stenosis of the internal sphincter, and the spasm and common pathological changes, intraoperative surgery for anal sinusitis can prevent recurrence and prevent acute attacks of postoperative anal sinusitis. 5, anal sinusitis surgical modalities The surgical treatment of anal sinusitis are anal sinusotomy, excision, anal papillae electrocautery, all have a certain degree of efficacy, but there is recurrence, excision bleeding, and difficult to cut clean. Some anal sinuses are more than 1 cm deep, but after incision, we see that they are not granulomatous sinus tracts, but epithelial inside, which should be removed or destroyed, otherwise they will form sinus tracts again after healing. We used electrocautery to achieve good results. The deepened sinus is probed and then cut open with an electric knife, followed by electrocautery to destroy the epithelium. The operation is simple and the efficacy is reliable.