Extra heavy menstruation after stopping taking progesterone may be due to the thickening of the uterine lining caused by taking progesterone, and the shedding of the thickened uterine lining will cause extra heavy menstruation. The reason for particularly heavy periods after stopping progesterone may be that progesterone is a progestin, which causes the endometrium to thicken when taken. Shedding of the uterine lining causes bleeding, which is called menstruation. The shedding of the thickened uterine lining will lead to increased bleeding, and therefore the menstrual flow will be extra heavy, which is an increase in menstruation caused by taking progesterone. This can be observed for a few more days and if it has returned to normal, no treatment is necessary. If the menstrual flow is still exceptionally heavy, it is recommended to take a blood test for the six sex hormones to determine whether the menstrual flow is exceptionally heavy due to endocrine disorders. Ultrasound is also recommended to check whether there are abnormal lesions in the endometrium, and diagnostic curettage should be performed if necessary. During menstruation, pay attention to personal hygiene, change underwear regularly, ensure sufficient sleep, and do not eat spicy and stimulating food. If the amount of menstruation is exceeded for a long time, you should go to the hospital for treatment in time.