In the case of menstruation there is still a little bit, it is recommended that it is best not to do a colonoscopy, and wait until the menstruation is completely clean before doing a colonoscopy. If it is an emergency situation, you can do colonoscopy, it is recommended that it is best to do after the colonoscopy, must keep the vulva local clean, mainly to avoid the possibility of infection. Because, after all, the lens of the colonoscopy is entered through the anus, so that in the clinic to cause vaginal infection chances are increased, it is recommended to maintain local cleanliness is also very important. Therefore, it is also recommended that if you do the corresponding examination in the clinic, unless the emergency situation, it is best to avoid the menstrual period and then do the corresponding examination, because in the menstrual period, some hormone levels in the body will change accordingly, the body’s resistance to decline, so if in the menstrual period, if you do some examination may affect the results, but also may lead to the occurrence of infection.