Pre-Menstrual Symptoms While on Birth Control Pills - Obstetrics and Gynecology

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Concerns about emergency contraceptive pills?


Hello, doctor.
I have been taking oral contraceptive pills for 7 months.
Every month, around the 20th pill (which is about a week before my period), I experience symptoms similar to those I had before I started taking the pills, such as lower back pain.
I would like to ask if these symptoms are related to my upcoming period.
If they are related, doesn't that mean that my period should only come after I stop taking the pills? How does my body know that I am about to stop the medication? Also, what would happen if I continue taking the pills back-to-back without stopping? Thank you.

Ji Wa Wa, 20~29 year old female. Ask Date: 2022/04/27

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, this should be a type of premenstrual syndrome.
Birth control pills are generally taken for 21 days, and menstruation usually occurs about 4 days after finishing the pack.
Birth control pills should be started on the fifth day of menstruation for 21 days, resulting in a menstrual cycle approximately every 28 days, which is normal.
If taken continuously, menstruation will not occur, but this is not the standard way of taking them.
Wishing you good health.

Reply Date: 2022/04/27

More Info


Understanding pre-menstrual symptoms while on birth control pills can be a bit complex, as hormonal contraceptives can influence your body in various ways. When you take birth control pills, they work by providing a steady level of hormones (estrogen and progestin) that prevent ovulation and regulate your menstrual cycle. However, many women still experience pre-menstrual symptoms (PMS) even while on the pill, and this can lead to confusion about how the body responds to hormonal changes.

Firstly, the symptoms you are experiencing, such as lower back pain, can indeed be related to the hormonal fluctuations that occur even when you are on birth control pills. While the primary function of these pills is to suppress ovulation and regulate your cycle, they do not completely eliminate the hormonal changes that can trigger PMS symptoms. In fact, many women report experiencing PMS-like symptoms during the placebo week of their pill pack or just before their period, even if they are on hormonal contraception.

The reason your body seems to "know" when to expect a period, despite being on the pill, is due to the cyclical nature of the hormones in the birth control regimen. Most birth control pills are designed to mimic a natural menstrual cycle, which includes a withdrawal bleed during the placebo week. When you reach the end of your pill pack and stop taking the active pills, the drop in hormone levels can trigger your body to shed the uterine lining, resulting in a withdrawal bleed that resembles a menstrual period. This is why you may still experience symptoms associated with menstruation, as your body is responding to the hormonal changes.

If you choose to skip the placebo week and continue taking the active pills back-to-back, this is known as continuous or extended-cycle birth control. Many women do this to avoid having a period altogether or to manage symptoms associated with menstruation. This method can be effective and is often prescribed for women who suffer from severe PMS or other menstrual-related issues. However, it is essential to consult with your healthcare provider before making this decision, as they can provide personalized advice based on your health history and needs.

It's also worth noting that while some women may experience fewer PMS symptoms while on the pill, others may find that their symptoms persist or even worsen. This variability can depend on individual hormonal responses, the specific formulation of the birth control pill, and other factors such as stress, diet, and lifestyle.

In conclusion, the symptoms you are experiencing are likely related to the hormonal changes associated with your birth control regimen. If you have concerns about your symptoms or are considering changing how you take your birth control pills, it is best to discuss this with your healthcare provider. They can help you understand your options and find a method that works best for you, ensuring that you maintain both your reproductive health and overall well-being.

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