Hemorrhoids are formed due to varicose veins inside the rectum, as well as after the anal cushion has moved down. First, because the rectal internal venous system does not have a valve, under the effect of gravity, the body is upright after the anus is relatively low, so the blood will be stagnant in the venous system, after a long time will lead to varicose veins, will form a lump towards the bottom of the anus. The second reason is the downward movement of the anal cushion, because when the human body defecates the anal cushion will move downward, and as it grows older, it will show up as hemorrhoids in the anus. Another important factor for women is pregnancy, because in the later stages of pregnancy, the uterus enlarges significantly and presses on the iliac vessels causing obstruction of venous return, so some patients will show hemorrhoids, and there may be varicose veins in the lower limbs at the same time.