After taking progesterone, the menstrual flow is very large, this situation is usually because the menstrual delay does not come, the use of taking progesterone after the withdrawal of bleeding to achieve the purpose of prompting the menstrual flow. Due to a long period of estrogen action, resulting in excessive proliferation of the endometrium, after taking progesterone under the action of progesterone, the excessive proliferation of the endometrium occurs in the secretory phase of the change, with the withdrawal of progesterone in the body, a large number of endometrial stripping and bleeding, it will lead to excessive bleeding. This condition usually does not require any special treatment, and most of them are able to stop on their own. Menstruation is obviously increased is 2-3 days time, before the use of medication need to fully communicate with the patient, let the patient clear vaginal bleeding is a normal reaction, can be stopped on their own, do not need to panic. However, if the amount of bleeding is unusually heavy, we should consider taking appropriate hemostatic drugs to stop bleeding.