If there is still a little bit of menstruation, it is clinically possible to do a gastroenteroscopy, after all, a gastroenteroscopy does not affect the final results of the examination. Since menstruation is out of the vagina, and gastroscopy is mainly in the stomach, and colonoscopy is from the anus into the intestinal tube to do the relevant examination, so there is not much connection between these three. As the blood clotting function will not be very good during menstruation, but gastroenteroscopy will not lead to excessive bleeding, just before doing gastroenteroscopy, you have to do the relevant routine examination, like blood routine, blood type, blood clotting function and so on. In fact, before doing gastroenteroscopy to actively cooperate with the doctor, may do enteroscopy to oral medication to clear the bowel, it is recommended to go to the regular professional hospital internal medicine, first diagnosis. In addition to do gastroenteroscopy before the need for hepatitis B, syphilis, AIDS and other diseases of the examination. In fact, in the diet need to pay more attention to, after all, improper diet, may affect the results of the examination.