There Will Be Blood

Blood: The Science, Medicine, and Mythology of Menstruation can now be found in the wild!

Today, January 23, is the publication date of my new book, Blood: The Science, Medicine, and Mythology of Menstruation. To celebrate, I am sharing an excerpt with you.

This book has been a labor of love and science. Wrestling the menstrual cycle, a massive topic, into a book that isn’t too heavy to lift was a massive feat, but I am very proud of the effort.

With each book, I feel I have helped a little to tear down misogynistic shame. Each time I saw the words “vagina” and “vulva” (from The Vagina Bible) or “menopause” (from The Menopause Manifesto) in print from interviews, in social media posts, or heard them on the radio and podcasts, I felt a chip at the patriarchy. But now, seeing and hearing the words “blood” and “menstruation” in so many places (even on the front page of the Globe and Mail in Canada and in two book reviews from The Guardian), I feel even more power. I know we are getting to that one thing that is the core of misogynistic shame. Shame thrives in silence, so when we speak and write openly about menstruation, we cast off that anchor, and we usher in knowledge and empowerment.

My book tour has now officially launched. You can check the events out here. I’ll be in Berkeley, Seattle, and West Hollywood this week, and next week, I’m off to D.C., NYC, and then Boston before heading up to Canada. I’ll be in the UK in March. Lots of people have asked about my event at 92Y in New York on February 1 with the amazing Sam Bee, and while it is sold out in person, you can register to watch via live stream. The details are here.

Hope to see you online or in person!

And yes, there will be blood.

Blood: The Science, Medicine, and Mythology of Menstruation

The menstrual cycle is the wheel that drives humanity.

Evolution demands that all species solve the equation of converting energy from the world around them into the next generation. Living things, from bacteria to blue whales, solve this equation in different and often ingenious ways based on their biology, environmental pressures, the care required for offspring to reach maturity, and even social structure. For example, some organisms reproduce asexually, some deposit unfertilized eggs that will hopefully get fertilized, and some have very long gestations, like an elephant, which carries its calf—which will ultimately weigh approximately 110 kg (243 pounds) at birth–for 22 months. 

Reproducing a human is a massive biological effort. Energy-wise, it’s on par with the limits of the most extreme sports, for example, running 5,000 km (3,000 miles) over 120 days or cycling the Tour de France. Walking upright, meaning being bipedal, results in a relatively smaller pelvis, which makes for a physically challenging and sometimes physically traumatic delivery, considering the relatively large head of a human fetus. Human infants are relatively helpless, a phenomenon known as secondary altriciality, so they require a significant amount of care, including breastfeeding, which is also metabolically demanding, and our ancestors had no choice but to pay this metabolic price and provide that physical care.

The platform that orchestrates turning this energy into offspring is the menstrual cycle, a unique trait seen in only a few species. To make human reproduction work, half the population needs to have a highly specialized biology that can be, repeatedly, hormonally rewired for a potential pregnancy, as well as bleed hundreds of times, and each time repair itself without scar tissue. And while biologically this is an evolutionary marvel, it’s also a source of aggravation, pain, and suffering for many, because retrofitting a body for a potential pregnancy and then bleeding for several days four hundred or so times over a lifetime can have medical consequences. At times it can be a faulty system, but individual discomfort or injury isn’t evolution’s concern, and in fact, evolution’s motto might be best summed up as “good enough.”

Unfortunately, instead of a world where those who bear the physical burdens of reproduction–whether they reproduce or not–have equal footing, we have the opposite. The Ancient Greeks, the originators of Western medicine, labeled the female body as inferior, and the act of menstruation has been viewed as proof that women have troublesome physiology and are by nature dirty and toxic. Many religions and cultures have long carried that same torch based on the erroneous belief of impurity and the idea that menstrual blood is filthy and contains actual toxins that poison the body (and especially men if they were to touch it). Women have been banned from places of worship, preparing food, having sex, and even banished from their own homes based on the supposed polluting powers of menstrual blood. And lest we think that was the medicine of yore, there was more than one letter published in 1974 in The Lancet, a leading medical journal, hypothesizing there may be sound medical beliefs to support the notion that menstrual blood was indeed toxic and that menstruating women could wilt flowers. I know, 1974!

I just can’t get my head around the concept of believing that menstruating women could wilt plants. If this were true it wouldn’t be a curse; it would be a weapon. After all, if they could, wouldn’t they have used that power to lay waste to entire crops, bringing kings, emperors, and governments to their knees? Yet the fact that no woman has ever done this, or even used magical plant wilting abilities to own a little land of her own, was not proof enough of its absurdity. But that is the patriarchy: facts are irrelevant; it’s the world order that matters.

As women were long viewed as lesser and more troublesome versions of men, the idea that their differences might be important and warrant specific study to offer them better care was largely absent from medicine. What happened instead was medicine was created for men and then retrofitted poorly for women. For many years, studying the reproductive tract mattered mostly for improving pregnancy outcomes rather than improving the lives of those who lived with those reproductive tracts. It wasn’t until 1993, yes 1993, that including women in medical studies became a requirement for government-funded research in the United States. And diseases unique to the reproductive biology attached to ovaries and a uterus are woefully underfunded compared with diseases that more commonly affect the other half of the population. We can blame medicine, and we should, but our government provides the funding for much of this work.

The practice of viewing female physiology as toxic throughout the ages has left a damaging legacy of inadequate research, dismissal by a patriarchal medical system, an uncaring society, and insufficient education about how the female body works. The consequences are that people struggle to get care, and the gaps in medicine are subsequently exploited by a rogue’s gallery of medical charlatans from the wellness industrial complex. When I scroll Instagram or TikTok, I’m horrified at the disinformation about the menstrual cycle and associated medical conditions that is perpetually propagated. There are creators claiming that menstrual blood can tell you about hormone levels, or that a “normal” period is less than three days in length and painless, or that eating raw carrots daily is essential to detoxifying dangerous estrogens, or that menstrual blood can be used as a face mask to treat acne because it has stem cells and special “healing” chemicals. To someone who knows science, this all comes off as ignorance masquerading as confidence. Look, if menstrual blood had magical healing powers, the vagina or vulva would age at a slower rate courtesy of 400 or so regenerative “menstrual spa” therapies.

The truth is many people haven't received enough information to distinguish medicine from mythology and disinformation is often simple and sexy and so it sells. Offering seemingly simple solutions is easy when you aren’t constrained by facts or the truth. And let’s be clear here: almost every answer offered by these menstrual charlatans is unstudied and unregulated, which is the antithesis of feminism. Feminism demands bodily autonomy, and that can be achieved only with facts. You cannot make an empowering decision about your health when the information you have been given is false. Lying about the body for profit is the patriarchy, and no amount of wrapping it with a pink bow or abusing words like natural can change that fact.

The best strategy, whether it’s dealing with a dismissive medical provider or sorting through endless menstrual misinformation on Instagram or TikTok, is a robust education, and that is the purpose of this book. I want you to have a solid knowledge of the menstrual cycle and the medical conditions and therapies associated with that cycle so you can be empowered. One aspect that is beyond our scope here is infertility; in my opinion, that is best addressed by a board-certified reproductive endocrinologist.

Also, a word about language. Not all women menstruate, and not everyone who menstruates is a woman. Women born without a uterus, trans women, women who have had a hysterectomy, and women who no longer menstruate or ovulate because they have gone through menopause are all women. Some trans men and gender nonbinary people menstruate. So how do we find terms that can encompass all these experiences? Some have used the word menstruator or person with a uterus, but I dislike distilling people down to bodily functions or parts, and some people don’t menstruate and some don’t have a uterus but still ovulate and so still have a menstrual cycle, so these terms don’t cover the totality of experiences. Another term that is used is pregnancy capable, but that sounds like reducing people to a potential incubator. In addition, not everyone with a uterus has any desire to be pregnant, while others have tried very hard to be pregnant and are not, and to them pregnancy capable might be jarring or hurtful. I’m also concerned that describing people by their reproductive capabilities seems to mostly apply to only half of the population, as ejaculator and potential impregnator seem largely absent from our current lexicon.

To me, the answer is clear: use the term people whenever possible when discussing the menstrual cycle. I trust people who are reading this book know what sections relate specifically to them and which ones aren’t applicable. If a study or an article being used as a reference describes the subjects as women, then that is how they will be described in these pages, and if they use a different term, then that will be used. When discussing history or the influences of society, the term women will generally be used, because the pathway of inadequate research and medical gaslighting started with the patriarchal concept that a female body that menstruated was a defective variant of a male body. And while jumping from people to women, to perhaps even from people to women and even those who menstruate, may seem an odd editorial choice to some, I feel it works well to honor the past while considering how we move forward.

I’ve been a gynecologist since 1995, and I’ve seen a lot of change during that time. We have amazing new therapies that weren’t possible when I trained and in my early years of practice. When I attended medical school in the 1980s, the idea that the human papillomavirus (HPV) caused cervical cancer was just a hypothesis, and now we can prevent cervical cancer with a vaccine against HPV. We now know so much more about so many conditions. I’ve also seen things that should have changed remain sadly stagnant. Research is slower than it should be, many people still struggle to access quality care, politicians in many parts of the world are still weaponizing reproductive health for political gain, and social media has provided a playground for disinformation.

For me, the answer to advocating in the doctor’s office, or insisting our political leaders do better, or sifting through the misinformation on social media, is to provide a source of quality information. I think back to my own experiences. I suffered from terrible menstrual diarrhea (yes, there is no good menstrual diarrhea, so while the qualifier might seem unnecessary, if you’ve had menstrual diarrhea, you get it). I thought I was uniquely broken because no one ever discussed this, not even Judy Blume. It wasn’t until I was a medical student, when we had a lecture about prostaglandins and I learned they could cause diarrhea and were released during menstruation, that I had my light bulb moment. I wanted to stand up and scream, “SAY WHAT NOW?” Of course, period diarrhea was a thing! I raced down after the lecture to ask the professor if the two might be connected, and his answer made it clear that he hadn’t really thought about it, but yes.

I promptly negotiated my way into the OB/GYN clinic, scooped up some sample packs of oral contraceptive pills, and by the next cycle was as close to menstrual nirvana as possible-- minimal cramping and no diarrhea. The next year in medical school, I learned you could take the pill every day and not have a period, and like magic, my periods were gone--except it was courtesy of medical research and some ingenuity on my own part. Before starting the pill, I had to plan my life around my menstruation, because when the diarrhea was bad, I might need a bathroom fifteen times a day. Now, I could just live my life.

There are several important take-home messages here. The first is that knowledge about my body and the available medications allowed me to make an informed decision and act on it. The second is that having quality knowledge about the menstrual cycle since age twenty, when I started medical school, meant I was essentially immune to the disinformation found everywhere, so I had nothing to unlearn. And the final one is the tenacious nature of menstrual shame. When I later found out that menstrual diarrhea affected 12% of people who menstruate, I was stunned. This phenomenon has at times ruined my life. Once, before my hormonal contraception era, I was lucky enough to go to New York City and visit the Metropolitan Museum of Art, but I spent the entire time in the bathroom with menstrual diarrhea. Why did I have to wait until I was in medical school to find out that I suffered from something that was common and could be treated? Why did I have to wait so long to find out that I was not in this alone?

Even now, when I mention menstrual diarrhea in a lecture (and you bet I do: letting everyone know about this phenomenon has become one of my missions), there’s always someone who approaches me afterward to tell me they thought they were the only one. Same thing when I post on social media: I get direct messages from people who thought they were alone in this. How’s that for gaslighting? Six percent of the world’s population will at one point in their lives experience menstrual diarrhea (when everyone is counted, those who menstruate and those who don’t), but it’s still something so few people know about? And yet 8% of Americans have asthma, and I’m sure every person old enough to read this book has heard of asthma.

One of my favorite experiences is when people who have read either The Vagina Bible or The Menopause Manifesto approach me and tell me how they found the information enlightening and empowering. I hear stories of how people advocated for an IUD, got physical therapy to treat pain with sex, or weren’t afraid to start vaginal estrogen because of words I wrote. That’s why I am writing this book–not just for the diarrhea education, of course, but for all of it. Because if you have, or have had, a menstrual cycle, or you know anyone who menstruates, or you have benefited from menstruation, you should know about it. (Let’s be real: everyone has benefited from menstruation; otherwise, you wouldn’t be alive to read this book). And if your menstrual cycle is troubling you, I want you to understand the science behind it and the therapies that are available so you can be empowered and advocate for yourself when needed.

The menstrual cycle is really the wheel that drives humanity, and it’s time to kick shame and lack of knowledge about it to the curb.