Anal fissures are one of the common anal diseases, which are mostly caused by bad habits in daily life. There are many triggering factors for anal fissures, and the degree of harm to people is also great, so what are the specific factors that trigger anal fissures? 1, long-term constipation: in the onset of anal fissure factors, constipation is actually the biggest factor causing anal fissure. The constipation, dry stool, defecation too hard, so that the anal skin tears, long-term retention of feces in the rectum can not only induce rectal lesions, and fecal accumulation also affects blood circulation. 2, long-term diarrhea: diarrhea, frequent defecation makes the anal canal sensitive tight, the normal consistency of feces can also cause damage, chronic inflammation of the anal canal, fibrous tissue hyperplasia, the formation of anal comb hard knots, preventing sphincter relaxation, making the anal canal vulnerable to injury rupture. 3, infection factors: anal gland infection is the root cause of anal fissure. Acute and chronic anal sinusitis, anal papillitis, internal hemorrhoids and polyps are the main causes of infection. The pathogenic bacteria of infection enter the anal gland through the gland mouth, generating abscesses in the subcutaneous tissue of the anal canal, forming anal canal ulcers after the abscesses break down, and small shallow thrombosis occurs due to infection, which can also lead to anal fissure. 4, trauma factors: women in childbirth tear the anal canal, can cause anal canal fissure. Once the fissure is infected, an anal fissure is formed by the formation of ulcers that do not heal for a long time. Rectal foreign bodies, improper anal expansion methods, anal surgery, congenital anal stenosis, proctocolitis, tuberculosis, etc. can also lead to anal fissures. 5.Anatomical factors: Due to the anatomical characteristics of the external anal sphincter, the muscles on both sides of the anal canal are tense, while the front and back are weaker and easily torn, so clinically rigid often occur in the anal truncation at 6 and 12 points for this reason, and the lack of blood supply and less elasticity in the posterior median line of the anal canal are the causes of anal fissure. 6, other factors: because people’s unreasonable dietary habits, chronic diseases and human physiological anatomical factors may induce anal fissures. Some people go to the toilet, there are like squatting position to read a book or newspaper, which causes squatting and defecation time prolonged, easy to cause stasis in the anorectum from the blood and induced anal disease. Through the introduction of the above article, we must strengthen the prevention of anal fissure. If you are already suffering from anal fissure, pay attention to it and make sure to go to a regular hospital for treatment for early recovery.