Withdrawal bleeding is caused by changes in hormone levels in the body due to the use of sex hormone medication, resulting in the shedding of the endometrium and vaginal bleeding. Generally speaking, withdrawal bleeding has little effect on the body and is in a sense equivalent to a menstrual flow. In case of withdrawal bleeding, it is important to pay attention to the cleanliness of the pubic area and increase nutrition appropriately, otherwise it may lead to delayed menstruation, gynaecological inflammation, anaemia and other symptoms.