The lower abdominal cramps during women’s periods may be physiological, but they may also be pathological, as follows: 1, physiological reasons: mostly seen in young little girls, due to the accumulation of menstrual blood in the uterine cavity can not come down, so there will be a small stomach cramps and pain, and so down after the symptoms will be relieved. This is the reason why women try to walk around the house as much as possible after the symptoms appear, so that the menstrual blood can come down as soon as possible. 2, pathological reasons: mostly seen in married women, because the endometrium grows to parts other than the uterine cavity, so when the menstruation comes, the endometrium in these parts also has to shed. Since the shedding does not come down, there will be pain in the small stomach, which is much more powerful than the pain of primary dysmenorrhea.