The possible causes of the phenomenon of menstruation half come and no more include: 1, a small amount of irregular bleeding after pregnancy, some women in the early stage of pregnancy, may be due to the lack of estrogen levels in the body, progesterone levels rise more slowly, and a small amount of endometrial exfoliation, causing a short period of a small amount of bleeding. In this case, if there is no more bleeding after a small amount of bleeding, you can go to the hospital for a relevant examination to clarify whether you are pregnant. 2. Menstrual disorders due to ovarian endocrine dysfunction may be caused by diseases or due to poor diet and living habits, causing abnormal changes in the endocrine function of the ovaries, which secrete The level of estrogen and progesterone is imbalanced and after a small amount of endometrial exfoliation bleeding, there is no more endometrial exfoliation thus leading to this phenomenon.