Irregular Periods and Ovulation in PCOS Patients - Obstetrics and Gynecology

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Doctor, my last menstrual period was from July 26 to July 31.
I experienced mild cramping on August 20, but it hasn't occurred again since then.
Is it possible that the cramping on August 20 was related to ovulation due to polycystic ovary syndrome (PCOS)? Can PCOS cause ovulation to occur this late? Could this delay menstruation? Note: The previous three months had menstrual intervals of 33 days and 35 days.
Today is the 33rd day, and my period hasn't arrived yet.
I initially thought the cramping indicated that my period was coming, but after that day, the pain stopped, and there haven't been any significant changes in discharge.
My girlfriend typically does not experience breast tenderness before her period, and she had a headache yesterday.
Recently, there hasn't been any feeling that her period is approaching, but she also doesn't feel unwell.
When I last asked you, you believed the chances of pregnancy were unlikely, so we are just waiting for her period to arrive.

Niming, 10~19 year old female. Ask Date: 2019/08/28

Dr. Huang Jianzhong reply Obstetrics and Gynecology


The last menstrual period was from July 26 to July 31.
I would like to know if the mild cramping on August 20 could be related to ovulation.
Is it possible for polycystic ovary syndrome (PCOS) to cause ovulation this late? Additionally, could this lead to a delayed menstrual period? Note: The intervals between the last two menstrual cycles were 33 days and 35 days.
Today is the 33rd day, and my period has not arrived yet.
I initially thought the cramping indicated that my period was coming, but after that day, the pain stopped, and there were no significant changes in discharge.
My girlfriend's menstrual cycle typically does not involve breast tenderness, and she experienced a headache yesterday.
Recently, there hasn't been any indication that her period is approaching, but she also doesn't feel unwell.
When I previously asked the doctor, they believed that the chances of pregnancy were unlikely, and advised to wait for the menstrual period to arrive.

Reply Date: 2019/08/28

More Info


Understanding irregular periods and ovulation in patients with Polycystic Ovary Syndrome (PCOS) can be quite complex due to the hormonal imbalances that characterize this condition. PCOS is a common endocrine disorder affecting women of reproductive age, and it often leads to irregular menstrual cycles, anovulation (lack of ovulation), and various other symptoms such as acne, hirsutism (excess hair growth), and weight gain.

In your case, you mentioned that your last menstrual period was from July 26 to July 31, and you experienced some mild cramping on August 20, but no further bleeding occurred after that. It is indeed possible that the cramping you felt on August 20 could have been related to ovulation, which can sometimes be accompanied by a phenomenon known as "mittelschmerz," or ovulation pain. In women with PCOS, ovulation can be irregular or delayed, which means that ovulation could occur later in the cycle than what is typically expected.

Given your previous menstrual cycles of 33 and 35 days, it is not unusual for your cycle to fluctuate. In women with PCOS, cycles can vary significantly, and ovulation may not occur every month. This irregularity can lead to delayed menstruation, as the hormonal signals that trigger the shedding of the uterine lining may not be consistent. Therefore, it is entirely plausible that you could experience ovulation later in your cycle, which could subsequently delay your period.

Regarding your question about whether this late ovulation could lead to a late period, the answer is yes. If ovulation occurs later than usual, it can push back the start of your menstrual cycle. For example, if you ovulated around August 20, you would typically expect your period to start about 14 days later, which would be around September 3. However, because of the irregular nature of PCOS, this timing can vary.

You also mentioned that you have not experienced any significant changes in discharge or other symptoms that typically accompany the onset of menstruation. This is not uncommon in women with PCOS, as they may not exhibit the same premenstrual symptoms as others. The absence of breast tenderness or other typical signs of menstruation does not necessarily indicate that your period will not come; it simply reflects the hormonal fluctuations that can occur with PCOS.

As for the headache you experienced, headaches can be a common symptom associated with hormonal changes, including those seen in PCOS. However, if you are concerned about the possibility of pregnancy, it is advisable to take a home pregnancy test or consult with your healthcare provider for further evaluation.
In summary, it is indeed possible for women with PCOS to experience late ovulation, which can lead to delayed menstruation. Monitoring your cycle and any associated symptoms can be helpful, but if you have ongoing concerns about your menstrual irregularities or potential pregnancy, it is best to consult with your healthcare provider for personalized advice and management options. They may recommend lifestyle changes, medications, or further investigations to help regulate your menstrual cycle and improve your overall reproductive health.

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