Have you ever noticed how your period changes when life gets chaotic?
Maybe you skip a cycle during a season of stress or your PMS gets worse when you’re not sleeping well. Maybe your flow lightens or your luteal phase shortens after switching up your diet or exercise routine. These shifts aren’t random—they’re signals.
This is exactly why many people now refer to the menstrual cycle as the “fifth vital sign”.
But what does that mean, and why does it matter?
The Menstrual Cycle: A Vital Reflection of Health
The idea of the menstrual cycle as the “fifth vital sign” first appeared in clinical and academic discussions in the early 2000s. One of the earliest references was during a 2004 symposium hosted by the Society for Menstrual Cycle Research, which advocated for recognizing the menstrual cycle as a meaningful marker of overall health. In 2006, the American College of Obstetricians and Gynecologists (ACOG) formally recommended evaluating the menstrual cycle as a vital sign during adolescent wellness visits—placing it on par with things like temperature, pulse, and blood pressure.
The concept is simple but powerful: when your cycle is functioning well, it reflects balance in your hormones, metabolism, and overall reproductive function. When something’s off—painful periods, irregular bleeding, missed cycles—it can signal underlying concerns such as PCOS, thyroid dysfunction, nutrient deficiencies, or chronic stress.
Unfortunately, even though this idea has been around for nearly two decades, it still isn’t fully embraced in many conventional healthcare settings. Many women find that their concerns about their cycles are brushed aside or quickly “managed” with hormonal birth control, rather than explored with curiosity and care.
Who Does Take It Seriously?
Enter: Restorative Reproductive Medicine (RRM)
Restorative reproductive medicine is a field of evidence-based women’s healthcare that prioritizes understanding and restoring healthy reproductive function—not suppressing it. Rather than defaulting to birth control for every menstrual complaint, RRM providers investigate why symptoms are occurring and address those root causes using lab work, targeted treatments, lifestyle changes, and natural hormone support.
Some approaches and organizations that practice this model include:
- FEMM Health (Fertility Education and Medical Management)
- NaProTECHNOLOGY (Natural Procreative Technology)
- NeoFertility
Each of these systems uses fertility awareness charting as a foundation for diagnosis and treatment. In other words: they don’t just acknowledge the menstrual cycle as a vital sign, they actively use it in clinical decision-making.
This root-cause approach aligns closely with my own practice. While I don’t always use the terminology “fifth vital sign,” the idea is central to the work I do with clients, whether we’re investigating cyclical symptoms, irregular cycles, missing periods, PCOS, or postpartum recovery.
Women Are Leading the Charge
While the mainstream medical community lags behind, women themselves have taken this concept to heart and started learning about their cycles in empowering new ways.
One of the most well-known advocates of this framework is Lisa Hendrickson-Jack, author of The Fifth Vital Sign. Her book has helped bring awareness of cycle health to a wider audience, showing women how to chart their cycles and understand them as a reliable, trackable marker of overall well-being.
And many fertility awareness educators across social media have also been instrumental, by sharing cycle charting tips, answering questions in real time, and helping women trust their own bodies and learn real solutions when conventional care hasn’t delivered.
What Your Cycle Can Tell You
When you begin tracking your cycle, you start to notice patterns, and those patterns can offer clues about your broader health picture.
Here are just a few examples:
- Missed or irregular periods can signal stress, under-nourishment, thyroid imbalance, or PCOS
- Very heavy bleeding might point to fibroids, estrogen dominance, clotting disorders, or inflammation
- Short luteal phases (less than 11 days between ovulation and your period) may indicate low progesterone
- Anovulatory cycles (bleeding without ovulating) can happen more often than people think, and usually go unnoticed without charting
Fertility awareness allows you to track these changes in real time and gives you the tools to start asking better questions and getting clearer answers.
You Deserve Better
Too many women have been told that their pain is normal. That their symptoms are just “part of being a woman”. That birth control is the only way to fix a problem that no one really looked into.
But you deserve more than that.
You deserve to feel confident in your body and informed about how it works.
You deserve practitioners who take your concerns seriously and help you find real, sustainable solutions.
You deserve to understand what your cycle is telling you.
Learning fertility awareness is the first step to reclaiming that understanding.
Ready to Get Started?
Purchase my eBook all about hormone and fertility testing to learn which labs are helpful (and when to ask for them).
Start learning to chart your cycle using an evidence-based symptothermal method in my recorded foundational class. Use code BLOG10 at checkout to get 10% off!
You don’t need to have a medical degree to understand your body.
You just need the right tools and the belief that your cycle is worth paying attention to.
And I’m here to help you do exactly that.
References
- American College of Obstetricians and Gynecologists (ACOG). “Menstruation in Girls and Adolescents: Using the Menstrual Cycle as a Vital Sign.” Committee Opinion No. 349, November 2006.
- Society for Menstrual Cycle Research (SMCR). Proceedings from the 2004 conference: “Menstruation: Research and Representation.”
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