Because the uterine opening is open during menstruation, it is easy to cause infection, so try to avoid colonoscopy during menstruation. If the amount of menstruation is small, and the colonoscopy has been done, and there is no symptom of abdominal pain, fever, etc. after the operation, there is no need to worry too much. Menstrual precautions: First, pay attention to hygiene, keep the vulva clean, do not take a sitz bath, tub bath and hot springs, abstain from sex. Second, pay attention to diet, avoid eating cold, spicy stimulating food, and blood-activating drugs, food, such as ginseng, alcohol and so on. So as not to cause increased menstrual bleeding, prolonged menstrual period, dysmenorrhea and other problems. Diet light and easy to digest food, you can drink brown sugar water. Third, pay attention to keep warm, should not take cold baths, avoid contact with cool water. Fourth, reduce all unnecessary operations, such as anal medication, vaginal examination or colonoscopy mentioned above. Fifth, pay attention to keep in a good mood, regular living, do not stay up late for a long time, and so on.