The main causes of thrombosed hemorrhoids are the following: 1, sedentary, standing: long-term walking will affect the blood circulation, blood stagnation in the pelvic cavity, so that the hemorrhoidal veins are congested and varicose, which can cause thrombosed hemorrhoids; 2, constipation, diarrhea: constipation, diarrhea can directly cause colorectal diseases, sometimes often constipation or diarrhea can directly stimulate the rectal mucosa, inflammation, edema and rectal prolapse. When constipation is too hard, it can directly form external hemorrhoids; 3, drinking alcohol, spicy food: can directly stimulate the rectal mucosa, because too much of this food after eating stool will have a burning sensation, can induce thrombosed hemorrhoids; 4, physiological structure factors: women generally have a higher incidence than men, especially in women’s pregnancy, after the increase in abdominal pressure during childbirth, often cause venous stasis, even during the process of delivery The pain and tearing of the perineum can cause blood return obstruction and thrombosed hemorrhoids.