Prolonged Menstrual Periods and Cranberry Capsule Effects - Obstetrics and Gynecology

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Prolonged menstrual period?


I would like to ask if it is normal to have only a small amount of dark-colored blood during the first week of my menstrual period? However, in the second week, the flow becomes normal (so the total duration is almost two weeks).
My second question is that I have been taking cranberry capsules, and I found that they do not have a blood-boosting effect.
Why, then, did I notice a significant increase in blood flow after taking the capsules, and the flow decreased to almost none after I stopped taking them? A few days after my period ended, I started taking the cranberry capsules again and experienced a small amount of dark-colored blood.
When I stopped taking them, the bleeding ceased.
Is this related to the cranberry capsules, or could there be an issue with my body? Thank you very much for your response.

Wu, 20~29 year old female. Ask Date: 2016/04/04

Dr. Yang Wangjun reply Obstetrics and Gynecology


Hello: (1) When there is abnormal vaginal bleeding, the first step is to check if the bleeding is caused by pregnancy.
Next, it is important to investigate whether there are any lesions causing the bleeding, such as endometrial hyperplasia, cervical polyps, or uterine fibroids.
If it is functional uterine bleeding, it is primarily related to the levels of estrogen and progesterone secreted by the ovaries.
For instance, if you experienced only a small amount of spotting in the first week, it could be related to luteal phase bleeding, possibly due to luteal insufficiency.
(2) Currently, there is no research indicating that cranberry is related to endometrial shedding bleeding.
However, since individual responses can vary greatly, if consuming cranberry leads to vaginal bleeding, it is advisable to discontinue its use.
Thank you for your message!

Reply Date: 2016/04/04

More Info


Prolonged menstrual periods can be concerning, and it’s important to understand the various factors that can influence menstrual flow and color. In your case, experiencing a lighter flow with darker blood during the first week of your period, followed by a heavier flow in the second week, can be indicative of several things.
Firstly, menstrual blood can vary in color and consistency. Darker blood often indicates older blood that has taken longer to exit the uterus, while brighter red blood is usually fresher. A lighter flow at the beginning of your period is not uncommon, especially if your menstrual cycle is irregular or if you are experiencing hormonal fluctuations. However, if your period lasts for two weeks or longer, it may be worth consulting a healthcare provider to rule out any underlying conditions such as hormonal imbalances, uterine fibroids, or polyps.

Regarding the cranberry capsules, they are primarily known for their potential benefits in urinary tract health rather than having any direct effect on menstrual flow or blood quality. Cranberry is rich in antioxidants and may help prevent urinary tract infections by preventing bacteria from adhering to the urinary tract walls. However, it does not have any known properties that would increase menstrual blood flow or alter its characteristics.

The observation that your menstrual flow increased while taking cranberry capsules could be coincidental or related to other factors such as dietary changes, stress levels, or hormonal fluctuations. It’s also possible that the timing of your menstrual cycle coincided with your use of the capsules, leading to the perception that they were influencing your flow.
If you notice a consistent pattern where your menstrual flow changes significantly with the use of cranberry capsules, it may be beneficial to discuss this with a healthcare professional. They can help determine if there is a correlation or if other factors are at play.
In summary, while cranberry capsules are not known to affect menstrual flow, your experience of prolonged periods and changes in flow should be evaluated by a healthcare provider. They can conduct a thorough assessment, including a physical examination and possibly hormonal testing, to determine if there are any underlying issues that need to be addressed. Keeping a menstrual diary, noting the flow, color, and any associated symptoms, can also provide valuable information for your healthcare provider.
If you have any further questions or concerns, please don’t hesitate to reach out for professional medical advice. Your health and well-being are important, and understanding your body’s signals is a crucial part of maintaining it.

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