What causes withdrawal bleeding from birth control pills?

In women's sexual life, it is inevitable to use contraceptives as a safety measure. However, if birth control pills are used too much, it will cause withdrawal bleeding. Although withdrawal bleeding is normal after using birth control pills, it is very harmful to women's bodies. People who have never used birth control pills don’t understand what withdrawal bleeding is. Next, let me introduce you to the knowledge about withdrawal bleeding from birth control pills.

(1) If menstruation occurs after progesterone injection (with withdrawal bleeding), it means: ① The uterus is normal and the endometrium has a normal response. ② The ovaries secrete a certain amount of estrogen, which causes the endometrium to proliferate. ③The functions of the central nervous system and hypothalamus-pituitary-ovary have been basically established, but ovulation is not yet possible.

(2) If menstruation does not occur after progesterone injection (except for physiological pregnancy, etc.), it means: ① The uterus may be abnormal. ② Insufficient ovarian estrogen secretion causes the endometrium to fail to proliferate and thus cannot shed and bleed. ③ Pseudo-amenorrhea caused by congenital atresia of cervix and vagina.

(3) Withdrawal bleeding is also called "substitute menstruation" and is the same as menstruation. It is called substitute menstruation because the bleeding days are controlled by medication instead of being calculated according to normal schedule. The next menstruation can be calculated as a menstruation based on this replacement menstruation, and the next menstruation will be based on this time.

Bleeding after taking emergency contraceptive pills is a common situation, which is clinically called withdrawal bleeding. In fact, this kind of bleeding is generally not considered as menstruation. Several situations of bleeding after taking emergency contraceptive pills: Women of childbearing age take emergency contraceptive pills at different times of the menstrual cycle, and the effects on menstruation will also be different.

Within 72 hours after sexual intercourse, emergency contraceptive pills can guarantee 80% contraception, but there is still a 20% risk, so it is best to prepare for contraception before starting sexual intercourse. But you should not engage in excessive sexual activity, as this is harmful to the health of both men and women. Don’t take too many birth control pills. You can use condoms instead. Condoms are convenient and practical, and have less negative impact on human health.