Irregular Menstrual Cycles: Causes and Concerns - Obstetrics and Gynecology

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Menstrual discharge


I used to have irregular menstrual periods, but for the past three months, my menstruation has been regular, arriving around the 13th of each month with normal flow.
However, this month, I have not gotten my period yet.
At the end of last month, I started experiencing increased vaginal discharge, which often dampened my underwear, so I used panty liners.
I thought my period was coming, but it has continued for a while without any menstrual flow, just the discharge.
About a week ago, I noticed a small amount of brown discharge, which is very minimal and does not fill the panty liner.
When I wipe after using the restroom, there is light pink spotting on the toilet paper.
Up until now, I still have not had my normal menstrual flow, which is typically bright red and of regular volume.
What could be the cause of this? Should I be concerned? P.S.
I have been facing a lot of exams recently, leading to frequent late nights.

Niming, 10~19 year old female. Ask Date: 2016/10/28

Dr. Huang Yiwen reply Obstetrics and Gynecology


Hello, Anonymous Sister: Your situation may be due to menstrual irregularities, which can cause abnormal bleeding (assuming there has been no sexual intercourse, making pregnancy unlikely).
The most common causes of menstrual irregularities are anovulation, which can be triggered by factors such as emotional stress, pressure, irregular sleep patterns, being underweight or overweight, illness, or the use of certain medications.
It is advisable to wait another week to see if your menstruation stops naturally, which would be less concerning.
However, if your menstrual cycle continues to be irregular, it is recommended that you visit a hospital for further examination.

Reply Date: 2016/10/28

More Info


Irregular menstrual cycles can be a source of concern for many women, and understanding the potential causes and implications is essential. In your case, it seems that you have experienced a period of regularity in your menstrual cycle over the past three months, with your period consistently arriving around the 13th of each month. However, the recent absence of your menstrual period, accompanied by changes in discharge, can be attributed to several factors.

Firstly, stress is a significant factor that can affect menstrual cycles. You mentioned that you are currently facing a lot of exams and have been staying up late, which can lead to increased stress levels. Stress can disrupt the hormonal balance in your body, particularly the hypothalamus, which plays a crucial role in regulating the menstrual cycle. This disruption can lead to delayed periods or even missed cycles.

Secondly, changes in your body weight, diet, or exercise routine can also impact your menstrual cycle. If you have experienced any fluctuations in weight, whether intentional or unintentional, this could be a contributing factor. Additionally, excessive exercise or sudden changes in physical activity can lead to irregularities in your cycle.

The presence of white discharge and the occasional spotting of light pink or brown discharge could indicate that your body is preparing for menstruation, but it has not yet occurred. This can happen due to hormonal fluctuations, which may be influenced by stress or other factors. The brown discharge is often old blood that takes longer to exit the body, while light pink spotting can occur as the uterine lining begins to shed.

It is also important to consider the possibility of pregnancy, especially if you are sexually active. If there is any chance of pregnancy, it would be advisable to take a home pregnancy test to rule that out. If the test is negative and your period still does not arrive, it may be worth consulting a healthcare provider for further evaluation.

In terms of whether you should be concerned, it largely depends on how long your period remains absent and whether you experience any additional symptoms. If your period does not return within a few weeks, or if you experience severe pain, heavy bleeding, or other concerning symptoms, it would be wise to seek medical advice. A healthcare provider can perform a thorough evaluation, which may include a physical examination, blood tests to check hormone levels, and possibly an ultrasound to assess your reproductive organs.

In summary, irregular menstrual cycles can be caused by various factors, including stress, lifestyle changes, and hormonal imbalances. Given your current situation with exams and potential stress, it is not uncommon for your cycle to be affected. However, if your period does not return soon or if you have any concerns, it is always best to consult with a healthcare professional for personalized advice and care. Taking care of your mental and physical health during this stressful time is crucial, as it can have a significant impact on your overall well-being and menstrual health.

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