Breakthrough Bleeding with Birth Control Pills - Obstetrics and Gynecology

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Breakthrough bleeding with contraceptive pills?


Hello Doctor: I have been taking the Yaz contraceptive pill for nearly a year, and during this time, I have experienced almost no side effects.
However, every two to three months, I notice vaginal bleeding about a week before taking the placebo pills (I take the pills at the same time every day).
Most of the bleeding is brownish, and occasionally there is some bright red blood, but the amount is very minimal (only noticeable when wiping or during sexual intercourse).
This bleeding lasts from about a week before I start the placebo pills until I finish them, and it only disappears after I start the next pack of pills.
After that, I usually have a normal cycle for two to three months before it happens again.
I believe this has occurred about three times.
Is this a side effect of the contraceptive pill? Thank you, Doctor.

Gina, 20~29 year old female. Ask Date: 2021/05/26

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, if you are not experiencing any discomfort and it does not occur every month, you can continue taking it.
Wishing you good health.

Reply Date: 2021/05/26

More Info


Breakthrough bleeding while taking birth control pills is a common concern for many women, and it can be quite alarming when it occurs. Based on your description, it seems that you have been taking the contraceptive pill for nearly a year without significant side effects, but you experience light vaginal bleeding, primarily brown in color, every few months during the week before you take the placebo pills. This is a situation that many women encounter, and it is important to understand the underlying reasons and what you can do about it.

Understanding Breakthrough Bleeding:
Breakthrough bleeding refers to any bleeding that occurs between menstrual periods while on hormonal birth control. It is particularly common in the first few months of starting a new contraceptive method, but it can also occur later on, as you have experienced. The bleeding you describe, especially being brown in color, typically indicates older blood that is taking longer to exit the body. This type of bleeding is often not a cause for concern, especially if it is light and not accompanied by severe pain or other symptoms.

Causes of Breakthrough Bleeding:
1. Hormonal Fluctuations: Birth control pills work by providing a steady dose of hormones to prevent ovulation. However, if the hormone levels fluctuate, it can lead to breakthrough bleeding. This is more common in pills with lower doses of estrogen or progestin.


2. Missed Pills: Even if you are diligent about taking your pills, occasional missed doses or taking them at irregular times can lead to breakthrough bleeding.

3. Body's Adjustment: Your body may still be adjusting to the hormonal changes induced by the pill, especially if you have been on the same pill for a long time.

4. Other Factors: Stress, illness, or changes in weight can also affect your menstrual cycle and lead to unexpected bleeding.

When to Seek Medical Advice:
While breakthrough bleeding is often benign, you should consult your healthcare provider if:
- The bleeding becomes heavy or is accompanied by severe pain.

- You experience bleeding that lasts longer than a few days.

- You have any other concerning symptoms, such as dizziness or fatigue.

- You have missed multiple pills or have concerns about your contraceptive method.

Managing Breakthrough Bleeding:
1. Consistency: Ensure that you take your pills at the same time every day to maintain stable hormone levels.


2. Consult Your Doctor: If breakthrough bleeding continues or worsens, it may be worth discussing with your healthcare provider. They might suggest switching to a different formulation of birth control that may be more suitable for your body.

3. Tracking Symptoms: Keep a record of when the bleeding occurs, its duration, and any other symptoms you experience. This information can be helpful for your doctor in determining the cause.

4. Lifestyle Factors: Consider factors such as stress, diet, and exercise, as these can influence your menstrual cycle and overall hormonal balance.

In conclusion, while breakthrough bleeding can be concerning, it is often a common side effect of hormonal contraceptives and may not indicate a serious problem. However, maintaining open communication with your healthcare provider is essential to ensure that your birth control method is working effectively for you and to address any potential issues that may arise. If you have further questions or concerns, do not hesitate to reach out to your healthcare provider for personalized advice and support.

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