Irregular Menstrual Cycles After Vaccination: What to Know

Experiencing two menstrual periods in one month that do not stop?

Hello, Doctor.
I experienced light bleeding on June 26 (not enough to require a pad), and my period started on July 2 with a normal flow, ending on July 8.
I received the COVID-19 vaccine on July 12, and then my period returned on July 15 with a heavy flow.
I went to the gynecologist that day, and everything was fine except for an ovarian cyst that needs to be monitored in three months.
The doctor prescribed me birth control pills for three months to regulate my cycle.
However, I continued to experience heavy bleeding, which made me feel dizzy.
On the fifth day, I returned to the doctor, who prescribed me Tranexamic Acid 250 mg and "Johnson" Ergotamine Tartrate 0.2 mg coated tablets, to be taken three times a day.
After taking it four times, the bleeding decreased but has not completely stopped.
I would like to ask: 1) Could the vaccine have an effect? I have never experienced this before, and I am very worried about whether these symptoms will resolve.
2) Is it normal for the bleeding to still not have completely stopped after five days of taking the birth control pills and one and a half days of the hemostatic medication? Thank you for taking the time to respond.

Xiao Huang, 40~49 year old female. Ask Date: 2022/07/20

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, there have been clinical cases of menstrual irregularities after vaccination.
The obstetrician-gynecologist has prescribed medication for treatment, and we will continue to observe the situation.
If there is no improvement, it is advisable to consult a physician.
Wishing you good health.

Reply Date: 2022/07/20

More Info

Irregular menstrual cycles after vaccination, particularly after receiving COVID-19 vaccines, have been a topic of interest and concern for many individuals. It is important to understand that while some people report changes in their menstrual cycles following vaccination, the scientific community is still investigating the extent and reasons for these changes.

1. Impact of Vaccination on Menstrual Cycles: Research has indicated that some individuals may experience temporary changes in their menstrual cycles after receiving a COVID-19 vaccine. These changes can include irregular bleeding, heavier periods, or changes in cycle length. The exact mechanism behind these changes is not fully understood, but it is hypothesized that the immune response triggered by the vaccine may influence hormonal regulation, which in turn can affect menstrual cycles. It is essential to note that these changes are generally considered temporary and should resolve over time.

2. Recovery of Normal Cycles: Many individuals who experience menstrual irregularities after vaccination report that their cycles return to normal within a few months. However, the timeline can vary from person to person. In your case, it is reassuring that you have consulted with a gynecologist, and they have not found any significant issues aside from the ovarian cyst that requires monitoring. This suggests that the irregular bleeding you experienced may indeed be related to the vaccination and not indicative of a more serious underlying condition.

3. Current Symptoms and Management: You mentioned that you have been prescribed hormonal contraceptives to help regulate your cycle and that you are also taking tranexamic acid to manage heavy bleeding. It is not uncommon for it to take some time for your body to adjust to hormonal treatments, and it may take a few cycles for your bleeding to normalize. If you are still experiencing heavy bleeding after several days of taking these medications, it is advisable to follow up with your healthcare provider. They may need to reassess your treatment plan or investigate further to ensure there are no other underlying issues contributing to your symptoms.

4. When to Seek Further Help: If you continue to experience heavy bleeding, dizziness, or any other concerning symptoms, it is crucial to seek medical attention. Persistent heavy bleeding can lead to anemia and other complications, so it is essential to address these symptoms promptly. Your healthcare provider may consider additional tests or alternative treatments to help manage your symptoms effectively.

In summary, while some individuals report changes in their menstrual cycles following vaccination, these changes are typically temporary and resolve over time. It is essential to maintain open communication with your healthcare provider regarding your symptoms and treatment plan. If you have any further concerns or if your symptoms persist, do not hesitate to seek further medical advice. Your health and well-being are paramount, and your healthcare team is there to support you through this process.

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