There are many causes of hemorrhoids and the main factors are: 1. Humans have paid a heavy price in the evolutionary process and hemorrhoids are one of them. When a person is upright, the pressure on the pelvic floor venous reflux is greatly increased, leading to stasis and expansion of the veins in the perineal pelvic floor and hemorrhoids. 2, the characteristics of the anatomical structure is also one of the factors of the high incidence of hemorrhoids. The veins of the pelvic floor do not have venous valves and cannot bear the pressure of the upper veins in a graded manner. The pressure of the vena cava is transmitted directly to the pelvic floor, while the increased pressure of abdominal pressure (such as coughing, weight bearing, etc.) is also transmitted directly downward, leading to varicose veins. 3.Women are the important cause of morbidity due to special physiological processes such as pregnancy and childbirth, and also the reason for their higher chance of morbidity than men. After pregnancy, as the fetus grows, abdominal pressure increases, the inferior vena cava is pressurized, affecting blood return, resulting in congestion and expansion of the hemorrhoidal plexus; in addition, the perineum is damaged to varying degrees, aggravating the venous reflux disorder, thus triggering hemorrhoids and many anorectal diseases. 4, the occurrence of hemorrhoids and sex hormone levels are closely related to the rectal submucosa has a spongy sinus-like structure, which is affected by sex hormones and the occurrence of congestion and edema and other pathological changes, the level of sex hormones increases in adulthood and leads to the occurrence of hemorrhoids, so hemorrhoids are common in adults. 5, sedentary, sedentary, long-term single posture and activity less people suffering from hemorrhoids: from the occupational analysis of drivers, hairdressers, salesmen, civilian police and other incidence rate of 81.7%, followed by cadres for 71.5%, workers for 70.3%, farmers for 62%, soldiers for 32.6%, students for 19.2%. 6, abnormal bowel habits is an important cause of hemorrhoids: constipation, diarrhea is the response to intestinal dysfunction, which can directly cause anal congestion and edema and skin mucosal damage, causing the anal cushion reticular fibers to fracture and move down to form hemorrhoids. 7, bad diet is also an important factor in the occurrence of hemorrhoids, which directly stimulates the intestinal mucosa, causing congestion and edema of the intestinal wall and chronic inflammation, which in turn leads to hemorrhoids. 8, chronic abdominal pressure increase in the disease is also one of the causes. Such as chronic cough, asthma, prostate hypertrophy, constipation, etc., so that abdominal pressure is often in a higher state, the pelvic floor venous reflux resistance increased triggered hemorrhoids. Knowing the causes will allow you to target prevention, some factors cannot be avoided, but we should do what we can to reduce the chances of hemorrhoids. Work habits can be changed, you can change your posture regularly, take a break from work, kick your legs, stretch your waist; dietary habits can also be changed, eat more light, nutritious, coarse fiber food, less spicy and stimulating food; timely treatment of chronic diseases and constipation, diarrhea and other diseases. Another important point: life is exercise, exercise can prevent the occurrence of many diseases.