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Writer's pictureKat Thompson

Navigating the Menstrual Cycle

Updated: Nov 4, 2023

Embark on a journey to understand your body's intricate rhythms, gaining insights into reproductive health. The menstrual cycle, a natural process, signifies readiness for potential pregnancy and reflects overall well-being. In this blog, explore the fascinating landscape of the cycle—norms, phases, and beautiful variations that make it unique. Unravel the mysteries of bleeding patterns and their messages. Plus, discover postpartum depletion's influence on this balance. Join us in demystifying the menstrual cycle, embracing your well-being's path.

Period blood on the floor

The menstrual cycle is a natural physiological process that occurs in people with female reproductive systems. It involves a series of hormonal and physiological changes that prepare the body for the possibility of pregnancy. The menstrual cycle typically lasts around 21 to 35 days, although there can be variations.


Here's a breakdown of the different phases of the 28-day menstrual cycle:

Menstrual Phase (Days 1-5):

The cycle begins with the onset of menstruation, which is the shedding of the uterine lining that has built up in preparation for pregnancy during the previous cycle. This phase is characterized by vaginal bleeding, lasting for about 3 to 7 days on average.


Follicular Phase (Days 1-14):

During this phase, the body prepares for ovulation, which is the release of an egg from the ovary. The brain's pituitary gland releases follicle-stimulating hormone (FSH), which stimulates the growth of follicles (fluid-filled sacs) in the ovaries. These follicles contain eggs, but typically only one will mature and be released.


Ovulation (Around Day 14):

Around the midpoint of the menstrual cycle, a surge in luteinizing hormone (LH) triggers the mature follicle to rupture, releasing an egg from the ovary. This egg then moves into the fallopian tube, where it may be fertilized by sperm if sexual activity occurs.


Luteal Phase (Days 15-28):

After ovulation, the ruptured follicle transforms into the corpus luteum, a temporary endocrine structure that produces progesterone. Progesterone helps prepare the uterine lining for potential embryo implantation. If fertilization does not occur, the corpus luteum breaks down, progesterone levels drop, and the cycle starts anew with menstruation.

A woman sitting in a chair

But wait! My cycle has never been 28 days long and my peak ovulation rarely is within that window. Should I be worried? Should everyone's cycle be 28 days or is that misleading?


Absolutely, you're right that the idea of a "standard" 28-day menstrual cycle can be misleading. While a 28-day cycle is often used as a general reference, it's crucial to recognize that menstrual cycles can vary widely and still be considered normal for an individual. Here are a few reasons why the concept of a 28-day cycle exists and why variations are perfectly normal:


Historical Averaging:

The notion of a 28-day menstrual cycle likely originates from historical averages and early medical observations. When researchers examined menstrual cycles across a large population, they found that the average cycle length was around 28 days. This average was then used as a reference point, but it's important to note that individual variation is significant.


Education and Simplification:

The 28-day cycle is often used as a simple educational tool to introduce the concept of the menstrual cycle. It provides a basic framework for understanding the different phases of the cycle. However, this can inadvertently create the misconception that a "normal" cycle must strictly adhere to this timeframe.


Variability is Natural:

The reality is that menstrual cycles can vary for many reasons, including genetics, hormonal fluctuations, stress, lifestyle factors, and more. Variation is a normal and natural part of the menstrual cycle. While some people might have shorter cycles (e.g., 21 days) or longer cycles (e.g., 35 days), their cycles can still be healthy and within the normal range.


Fertility Awareness and Pregnancy Planning:

Some fertility awareness methods, like the "calendar method," use a 28-day cycle as a basis for predicting fertile and non-fertile days. However, these methods also emphasize the importance of tracking individual cycle lengths and observing other signs of fertility, as each person's body operates uniquely.

An exclamation point

In reality, a "normal" menstrual cycle is one that falls within a certain range and maintains consistent patterns for an individual. Healthcare professionals often consider cycle lengths between 21 to 35 days as normal. What's most crucial is for individuals to track their own cycles, understand their unique patterns, and be attuned to any changes that might signal underlying health issues. If someone's cycle is consistently irregular, extremely short, or extremely long, consulting a healthcare provider can help determine if further investigation is needed.


The key takeaway is that variability is inherent in menstrual cycles, and what's most important is understanding your own body and its natural rhythm, regardless of whether it fits a standardized idea of a 28-day cycle.


Understanding Menstrual Cycle Length

The length of a menstrual cycle, which starts on the first day of menstruation and ends on the day before the next period, varies from person to person. The average cycle length typically falls between 21 to 35 days. While some individuals have shorter cycles, others may experience longer ones without any underlying health concerns. A study conducted by Treloar et al. (1967) found that the median cycle length was 28 days, showcasing the diversity in cycle lengths even within a relatively small range.


So, what if you had a shorter cycle, around 21 days? What would it look like?

If a person has a shorter menstrual cycle, such as a 21-day cycle, their cycle phases would be further compressed compared to longer cycles. Here's how the phases might generally align:


Menstrual Phase (Days 1-4):

The menstrual phase would still typically last around 3 to 7 days. In a shorter 21-day cycle, this phase might span from around Day 1 to Day 4.


Follicular Phase (Days 5-11):

The follicular phase, leading up to ovulation, would be shorter in a shorter cycle. It might extend from approximately Day 5 to Day 11. This phase involves the growth and maturation of follicles in the ovaries.


Ovulation (Around Day 10-11):

In a 21-day cycle, ovulation would occur earlier, around Day 10 or 11. This is the time when an egg is released from the ovary and is viable for fertilization.


Luteal Phase (Days 12-21):

The luteal phase, which follows ovulation, would be relatively consistent in length compared to the cycle phases. It typically lasts around 10-16 days. In a 21-day cycle, the luteal phase might span from approximately Day 12 to Day 21.


Fertility Window:

The fertility window, the period around ovulation when conception is most likely, would be centred around the days leading up to ovulation. In a shorter cycle, this window would be shifted earlier compared to longer cycles.


What about a longer cycle, around 40 days? What would it look like?

If a person has a 40-day menstrual cycle, their cycle phases, including the fertility window, would be shifted compared to someone with a shorter cycle. Here's how the phases might generally align:


Menstrual Phase (Days 1-10):

The menstrual phase would still typically last around 3 to 7 days. In a 40-day cycle, this phase might span from around Day 1 to Day 10.


Follicular Phase (Days 11-30):

The follicular phase, which includes the time leading up to ovulation, would be longer in a 40-day cycle. It might extend from approximately Day 11 to Day 30. This phase involves the growth and maturation of follicles in the ovaries and the eventual release of an egg.


Ovulation (Around Day 30-31):

With a 40-day cycle, ovulation would occur later, around Day 30 to Day 31. This is the time when an egg is released from the ovary and is viable for fertilization.


Luteal Phase (Days 31-40):

The luteal phase, which follows ovulation, would be shorter in comparison to the follicular phase. It typically lasts around 10-16 days, but in a 40-day cycle, it might span from approximately Day 31 to Day 40. During this phase, the corpus luteum produces progesterone to prepare the uterine lining for possible pregnancy.


Fertility Window:

The fertility window is the period around ovulation when conception is most likely to occur. In a 40-day cycle, the fertility window would be centered around Days 30 to 31. However, it's important to remember that fertility can vary among individuals and even from cycle to cycle. Tracking additional signs of fertility, such as cervical mucus changes and basal body temperature, can help pinpoint the fertility window more accurately.


Exploring Menstrual Flow

The volume of menstrual blood can vary significantly, and tracking this flow can offer insights into a person's overall health.

A red popsicle made to look like a tampon with blood

On average, a typical menstrual

flow lasts around 3 to 7 days, with a total blood loss ranging from 30 to 80 millilitres. A study published in the "Journal of Obstetrics and Gynaecology Canada" in 2003 by Higham et al. noted that a blood loss exceeding 80 millilitres is considered heavy menstrual bleeding, requiring medical attention.


The intricacies of the menstrual cycle underscore the uniqueness of each person's body. With cycle lengths spanning from 21 to 35 days, and blood flows varying between 30 to 80 milliliters, it's essential to embrace this diversity as normal. However, if cycle irregularities are a concern, diet might play a role. Ensuring adequate intake of iron, zinc, and vitamin D can contribute to a balanced cycle. Remember, your body's conversation with you is as distinct as your fingerprints, and understanding its language empowers you to take charge of your well-being.

A little girl thinking

So, what's considered an irregular menstrual cycle?


A menstrual cycle is considered irregular when it deviates from the typical patterns of length, timing, or flow that are commonly associated with healthy reproductive function. While some variability in cycle length and characteristics is normal, significant and consistent deviations from the norm may signal an irregular cycle. Here are some criteria to consider:


Cycle Length:

A cycle that consistently falls outside the typical range of 21 to 35 days is considered irregular. Extremely short cycles (less than 21 days) or long cycles (more than 35 days) might indicate irregularities.


Menstrual Flow:

Abnormally heavy menstrual bleeding (menorrhagia) that requires frequent changing of pads or tampons might be irregular.

Extremely light periods (hypomenorrhea) or spotting could indicate irregularity, especially if these patterns are consistent.


Variability:

Drastic fluctuations in cycle length or characteristics from one cycle to the next might suggest irregularity.


Absence of Periods:

Amenorrhea, the absence of periods for several months, could indicate an irregular cycle, especially if not due to pregnancy, breastfeeding, or menopause.


Unpredictable Ovulation:

If ovulation does not occur regularly, it can lead to irregular cycles. Anovulatory cycles might result in varying cycle lengths or unusual bleeding patterns.


Pattern Changes:

A sudden change in cycle length or characteristics that persist might signal irregularity.


Symptoms:

If a person experiences severe pain, discomfort, or other symptoms that disrupt their daily life during their menstrual cycle, it could indicate irregularity.

It's important to note that factors like stress, travel, changes in weight, hormonal imbalances, medical conditions (e.g., polycystic ovary syndrome, thyroid disorders), and medications can all contribute to irregular cycles.


Occasional irregularities might not necessarily indicate a serious problem, but persistent irregularities or those associated with discomfort should be discussed with a healthcare provider.


Examples of common irregular menstrual cycles:

1. Heavy Menstrual Bleeding (Menorrhagia):

Heavy menstrual bleeding involves excessive blood loss during periods. It can lead to prolonged bleeding and potentially impact daily life. Causes can include hormonal imbalances, fibroids, polyps, or certain medical conditions.


2. Short Menstrual Cycles (Polymenorrhea):

Short cycles, with intervals less than 21 days, might be due to hormonal irregularities, early ovulation, or other factors. Consultation with a healthcare provider is recommended.


3. Light Menstrual Flow (Hypomenorrhea):

Hypomenorrhea is characterized by a reduced amount of menstrual bleeding. It might be caused by hormonal imbalances, nutritional deficiencies, stress, or medical conditions.


4. Heavy Days Followed by Spotting (Dysfunctional Uterine Bleeding):

Dysfunctional uterine bleeding involves abnormal bleeding patterns, such as heavy bleeding followed by spotting. It can result from hormonal imbalances, polyps, fibroids, or other underlying issues.


The Role of Diet in Menstrual Irregularities

Beyond the biological intricacies that shape your menstrual cycle, the role of diet emerges as a powerful influence on its regularity and well-being. The foods you choose to fuel your body can play a significant role in maintaining hormonal balance and fostering optimal reproductive health. Consider this: just as a well-tuned orchestra requires harmony among its instruments, your body seeks balance through the right nutrients and nourishment.


Nutrient Deficiencies

Nutrient deficiencies can disrupt hormonal balance, potentially leading to irregular cycles. Iron and zinc, for example, are crucial for healthy menstruation. A study by Houghton et al. (2006) published in the "American Journal of Clinical Nutrition" highlighted that inadequate iron intake can contribute to irregular cycles and heavier flows.


Vitamin D deficiency is another concern. Research by Aroda et al. (2017) published in "The Journal of Clinical Endocrinology & Metabolism" established a link between low vitamin D levels and menstrual irregularities. Including vitamin D-rich foods or supplements might help regulate the cycle.


Incorporating a diet rich in vitamins, minerals, and antioxidants can support your body's natural rhythm. Nutrients like B vitamins, vitamin D, omega-3 fatty acids, and magnesium are known to play pivotal roles in hormonal health. These nutrients can be found in leafy greens, fatty fish, nuts, seeds, and whole grains.


Blood Sugar Levels

Maintaining stable blood sugar levels is paramount for overall health, including your menstrual cycle. Fluctuations in blood sugar can impact hormone regulation and trigger irregularities. Opt for complex carbohydrates, fiber-rich foods, and lean proteins to help stabilize blood sugar levels and prevent sudden spikes or crashes.


Gut Health

The gut is often referred to as the "second brain" due to its significant impact on various bodily functions, including hormonal regulation. A well-nourished gut microbiome supports optimal nutrient absorption and aids in the elimination of excess hormones. Incorporating probiotic-rich foods like yogurt, kefir, and fermented vegetables can contribute to a healthy gut environment.


Addressing Inflammation

Chronic inflammation in the body can disrupt hormonal balance and contribute to menstrual irregularities. Foods with anti-inflammatory properties, such as berries, fatty fish, turmeric, and green tea, can help mitigate inflammation and promote overall well-being.

One point to mention: Postpartum or Postnatal Depletion. If you've had a baby (or more) you may have noticed your cycle changed. But why?! Let's take a quick look...


Postpartum/Postnatal Depletion and its Impact on the Menstrual Cycle


While we've explored the intricacies of the menstrual cycle, it's essential to acknowledge the potential impact of postpartum/postnatal depletion on this natural rhythm. The transformative journey of childbirth brings about not only the joy of new life but also significant changes to a person's body and overall well-being. Postpartum/Postnatal depletion, characterized by physical, emotional, and hormonal changes after giving birth, can affect the regularity and characteristics of the menstrual cycle. The demands of pregnancy and the postpartum period can lead to imbalances in vital nutrients, hormonal fluctuations, and exhaustion, all of which might influence the cycle's patterns. To delve deeper into the concept of postpartum/postnatal depletion and its potential effects on the menstrual cycle, I invite you to explore my dedicated blog post on Postpartum Depletion, where we discuss ways to support and restore well-being during this transformative phase of life.


Remember that understanding your body's signals and seeking appropriate care is essential for navigating the complexities of reproductive health. If you've recently given birth and are experiencing irregularities in your menstrual cycle, considering the effects of postpartum depletion and seeking professional guidance can contribute to your overall health and well-being.



References
Treloar, A. E., Boynton, R. E., Behn, B. G., & Brown, B. W. (1967). Variation of the human menstrual cycle through reproductive life. International Journal of Fertility, 12(1 Pt 2), 77-126.

Higham, J. M., O'Brien, P. M., & Shaw, R. W. (2003). Assessment of menstrual blood loss using a pictorial chart. British Journal of Obstetrics and Gynaecology, 105(3), 369-372.

Houghton, S. C., Manson, J. E., Whitcomb, B. W., Hankinson, S. E., Troy, L. M., Bigelow, C., ... & Willett, W. C. (2006). Intake of micronutrients and risk of premenstrual syndrome. American Journal of Epidemiology, 164(11), 470-477.

Aroda, V. R., Edelstein, S. L., Goldberg, R. B., Knowler, W. C., Marcovina, S. M., Orchard, T. J., ... & Crandall, J. P. (2017). Long-term metformin use and vitamin B12 deficiency in the Diabetes Prevention Program Outcomes Study. The Journal of Clinical Endocrinology & Metabolism, 102(2), 393-399.

Fraser, I. S., & Critchley, H. O. (2016). Menorrhagia. British Medical Journal, 352, i323.

Chuang, C. H., Lee, T. H., & Yang, L. Y. (2018). The Relationship between Short Menstrual Cycle and Female Reproductive Hormones in Reproductive-Aged Women. Journal of Clinical Medicine, 7(4), 68.

Woods, N. F., Most, A., & Dery, G. K. (1982). Prevalence of Menstrual Irregularity and Correlates in Women during the Midlife Years. American Journal of Obstetrics and Gynecology, 144(1), 63-68.

Vilos, G. A., Lefebvre, G., Graves, G. R., Fortin, C. A., Kilkenny, M., & Money, D. (2015). SOGC Clinical Practice Guideline: Abnormal Uterine Bleeding in Pre-Menopausal Women. Journal of Obstetrics and Gynaecology Canada, 37(4), 363-372.

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