Irregular Menstruation After Childbirth: Causes and Concerns - Obstetrics and Gynecology

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Irregular menstruation


Hello, Dr.
Cheng! It has been 8 weeks since delivery, and my first menstrual cycle has come.
The flow is very heavy; the pad is almost completely soaked within 2-3 hours, with a lot of blood clots, and it has lasted for several days.
The doctor said it is irregular menstruation, not a true miscarriage.
After receiving an injection and taking medication, the bleeding stopped the next day.
The doctor mentioned that after taking the second dose of medication, a normal menstrual cycle would follow.
However, after finishing the medication, the bleeding resumed the next day, but it is the same as before; it has been 4 days, and the flow is still heavy, requiring a pad change every 2-3 hours.
Additionally, I am experiencing lower abdominal pain.
This is my second pregnancy, and I had similar issues during my first pregnancy.
May I ask: 1.
What is meant by irregular menstruation? 2.
What causes it? 3.
If I do not receive an injection or take medication, will it stop on its own? Could this lead to excessive blood loss, causing anemia or other health issues?

Angel, 30~39 year old female. Ask Date: 2002/09/03

Dr. Li Guanghan reply Obstetrics and Gynecology


It is normal for menstruation to return 6 to 8 weeks postpartum.
Generally, the first two menstrual cycles after childbirth may not be regular due to elevated prolactin levels, which can lead to anovulatory cycles.
Women may experience higher estrogen levels and increased menstrual flow.
If the flow is excessively heavy, treatment may be necessary to prevent anemia.

Reply Date: 2002/09/03

More Info


Irregular menstruation after childbirth, often referred to as "postpartum irregularities," can be a common concern for many women. In your case, experiencing heavy bleeding with large blood clots and prolonged duration can be alarming, especially since this is your second occurrence of similar symptoms. Let’s break down your questions and concerns regarding this issue.

1. What is irregular menstruation?
Irregular menstruation, or "menstrual irregularity," refers to any deviation from the normal menstrual cycle. This can manifest as changes in the frequency, duration, or volume of menstrual bleeding. After childbirth, it is not uncommon for women to experience irregular cycles as the body undergoes hormonal adjustments. The first few menstrual cycles postpartum may be particularly unpredictable due to the fluctuations in hormone levels as the body transitions back to its pre-pregnancy state.

2. What causes irregular menstruation after childbirth?
Several factors can contribute to irregular menstruation after childbirth:
- Hormonal Changes: After delivery, the body undergoes significant hormonal shifts. The levels of estrogen and progesterone fluctuate as the body adjusts, which can lead to irregularities in the menstrual cycle.

- Uterine Recovery: The uterus needs time to heal and return to its normal size after pregnancy. This process can affect menstrual flow and timing.

- Breastfeeding: If you are breastfeeding, the hormone prolactin, which is responsible for milk production, can suppress ovulation, leading to irregular periods or even amenorrhea (absence of menstruation).

- Underlying Conditions: Conditions such as polycystic ovary syndrome (PCOS), thyroid disorders, or uterine abnormalities can also contribute to irregular menstruation.

3. Will it stop on its own without medication?
While some women may find that their menstrual irregularities resolve on their own over time, others may continue to experience heavy bleeding and discomfort. In your case, given the significant volume of bleeding and the presence of blood clots, it is crucial to monitor your symptoms closely. Heavy menstrual bleeding (menorrhagia) can lead to complications such as anemia if not managed properly. If left untreated, excessive blood loss can result in fatigue, weakness, and other health issues.

If you choose not to take medication, it is essential to keep track of your bleeding patterns. If the bleeding persists or worsens, or if you experience symptoms such as dizziness, shortness of breath, or extreme fatigue, you should seek medical attention promptly. Your healthcare provider may recommend further evaluation, including blood tests to check for anemia or imaging studies to assess the uterus.

In conclusion, postpartum irregular menstruation is a common issue that can arise due to hormonal changes, uterine recovery, and other factors. While some women may experience a return to normalcy without intervention, others may require medical treatment to manage heavy bleeding and prevent complications. It is essential to maintain open communication with your healthcare provider and report any concerning symptoms to ensure appropriate care and support during this transitional period.

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