Menstrual Changes After Starting the Mirena IUD - Obstetrics and Gynecology

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Hello, doctor.
I would like to ask about my situation.
I took emergency contraceptive pills on July 2 and July 4, and my menstrual period started on July 12, when I also began using the Mirena IUD.
I have not experienced any discomfort, but I noticed that my menstrual flow has decreased, and the duration has increased by two days compared to before.
Prior to using the IUD, my menstrual flow was heavier, averaging about five days.
On July 26, I started to notice a small amount of bleeding, and I removed the IUD on August 2 after it had been in place for 21 days.
There was no sexual intercourse during this time, but the bleeding continued until August 3.
I would like to know if this situation is normal for first-time users, or if it indicates that the Mirena IUD may not be suitable for me.

mm, 20~29 year old female. Ask Date: 2021/08/03

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it should be normal; just monitor it.
Wishing you good health.

Reply Date: 2021/08/03

More Info


The Mirena IUD, also known as a hormonal intrauterine device, is a popular contraceptive option that releases levonorgestrel, a type of progestin, to prevent pregnancy. Many women choose Mirena for its effectiveness and the convenience of not having to take a daily pill. However, it is common for women to experience changes in their menstrual cycle after starting the Mirena IUD, and these changes can vary widely from person to person.

In your case, you mentioned that after starting the Mirena IUD, you noticed a reduction in menstrual blood flow and an increase in the duration of your periods. This is not unusual. Many women report lighter periods after the insertion of Mirena, and some may even experience a complete cessation of menstruation over time. The hormonal effects of the IUD can lead to thinning of the uterine lining, which often results in lighter menstrual bleeding. However, it is also common for some women to experience irregular bleeding or spotting, especially in the first few months after insertion. This can include light bleeding or spotting between periods, which may be what you are experiencing.

The initial adjustment period after inserting the Mirena IUD can last for several months. During this time, your body is adapting to the presence of the IUD and the hormones it releases. It is not uncommon for women to have irregular bleeding patterns during this adjustment phase. In your situation, the fact that you experienced some bleeding after the IUD was inserted and that it continued for a few days after removal is also within the realm of normal. The hormonal fluctuations caused by the IUD can lead to changes in your menstrual cycle, and it may take some time for your body to stabilize.

If you are concerned about the changes you are experiencing, it is essential to consult with your healthcare provider. They can help determine whether what you are experiencing is typical or if there may be other underlying issues that need to be addressed. It is also important to note that while the Mirena IUD is generally well-tolerated, some women may experience side effects such as cramping, headaches, or mood changes. If these side effects are severe or persistent, you should discuss them with your doctor.

Regarding your question about whether the Mirena IUD is suitable for you, it is essential to consider your individual health needs and preferences. The Mirena IUD is an effective form of contraception for many women, but it may not be the best choice for everyone. Factors such as your medical history, lifestyle, and personal preferences should all be taken into account when deciding on a contraceptive method.

In summary, experiencing changes in your menstrual cycle after starting the Mirena IUD is common and can include lighter periods, irregular bleeding, or spotting. These changes are typically temporary as your body adjusts to the IUD. If you have concerns about your menstrual changes or any other symptoms, it is advisable to consult your healthcare provider for personalized advice and guidance.

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