长时间坐在松软的沙发里,导致腹部流速度减慢,妨碍血液循环,下肢静脉血能回流,血液循环受阻,直肠静脉丛易发曲张,血液淤积,形成一个静脉团,这就痔疮。预防痔疮,应多坐硬板凳。当人坐硬板凳上时,由于臀部有两个坐骨节支,就不会妨碍血液循环。此外,经常用力运重物的人、妊娠晚期? Prolonged sitting on a soft sofa, resulting in slow abdominal flow, impede blood circulation, venous blood can be reflux, blood circulation blocked, rectal venous plexus prone to varicose, blood siltation, the formation of a vein group, which hemorrhoids. Prevention of hemorrhoids, should sit more hard bench. When people sit on a hard bench, there are two ischial tuberosities on the buttocks, so they do not interfere with blood circulation. In addition, those who often carry heavy loads, late pregnancy?