Clearly menstruation but no blood is how to return a responsibility

If there is no blood in the vagina during menstruation, you need to go through color Doppler examination to see the thickness of the endometrium. If the endometrium is too thin or adhesions occur in the endometrium, it will cause this situation, but the specific cause is what needs to be checked to know. If pregnancy with blood-activating drugs is easy to cause abortion, poor menstrual blood circulation is also easy to cause abdominal pain, this situation will be more serious, this time to develop good habits, can not stay up late.