女性从青春期开始,便有每月一次的月经,如何进行经期的自我护理,关系到广大女性朋友的身心健康,为什么会出现月经呢?从医学角度来讲,卵子经卵巢排出后,经过输卵管的蠕动,而被送入到子宫腔,如果没有被受精,即同分泌期的子宫内膜一起排出体外,即月经来潮。在正常情况下,月经一般持续 Women from adolescence, there will be monthly menstruation, menstrual menstrual how menstruation, related to the general physical and mental health of female friends, why menstruation occurs? From a medical point of view, the ovum after ovarian discharge, the fallopian tube Peristalsis, and was sent to the uterine cavity, if not fertilized, that is, with the secretion of the endometrium excreted, that menstrual cramps. Under normal circumstances, menstruation generally lasts