The main reason for the development of sinusitis is that the opening of the anal sinus is upward, which can easily accumulate feces and cause infection, resulting in spasm of the anal sphincter and poor drainage of the anal sinus. The infection is not easily controlled and causes inflammation and hypertrophy of the anal papilla. The rectum gradually becomes thinner and narrower from the middle to the lower end, and as the intestinal cavity contracts at the anus, the mucosa of the intestinal wall folds up like the cuffs of a person’s clothes, forming many longitudinal folds, which are medically called rectal pillars or anal pillars. The bottom of the two pillars are connected by a half-moon shaped crease, which is called the anal flap. Between the two rectal pillars and the anal flap, a funnel-shaped sunken fossa with an upward opening is formed, which is the anal sinus, also called the anal crypt. At the bottom of the sinus are the anal glands and ducts that secrete fluid, which normally produce mucus to lubricate the stool and protect the rectum and anus. Because the sinus is like a funnel, the opening is opened upward, and stool and other dirty things can easily accumulate in the sinus and be broken by hard stool abrasions. After the invasion of bacteria will cause infection in the anal sinus and spread along the anal gland ducts and anal glands, so anal sinusitis is also the root cause of many anorectal diseases, such as perianal abscess, anal fistula, anal fissure, hemorrhoids, anal papillitis, etc. The occurrence of epithelial cancer of the anal canal is also related to the stimulation of chronic anal sinus inflammation. The following tests should be done for anal sinusitis: 1.Anal finger examination: sphincter tension, hard nodules and tenderness in the anal sinus and papillae. 2, anoscopy: anal sinus, anal papillae congestion and redness. The main points of diagnosis are 1. urgency and heaviness, the feeling of falling in the anus, the desire to defecate, but go to the toilet but can not solve or rarely solve the stool. 2, painful anal discomfort and vague pain, aggravated by defecation. 3.Small amounts of mucus and blood may be present in the stool. 4.Anal sinus and anal papillae are painful to touch during anal finger examination. 5.Anoscopic examination of anal sinus and anal papillae is congested and red and swollen. The following explains how to pay attention to the prevention and treatment of anal sinusitis: 1, dietary regulation, eat more vegetables and fruits, drink more water, prohibit the consumption of chili peppers, prohibit alcohol, 2, keep the bowel movements smooth, prevent constipation. Constipation can be appropriate with laxative preparations, but also available open plug. 3, appropriate internal anti-inflammatory drugs. 4, local application of hemorrhoid suppositories. 5.Drug enema. 6, keep the anus clean, morning and evening each salt water sitz bath once. Warm tip: Anal diseases should not be ignored, if you find yourself with anal diseases, you should go to the hospital for timely treatment.