[00:00:00] Speaker 4: Welcome to Peri in Pause, the podcast where midlife women get real answers about their bodies, their health, and what's actually changing. Because every woman deserves this conversation

[00:00:18] Speaker: Welcome back to Perimenopause the Podcast, where we talk about all things midlife women's health, life, experience, share the best. I'm Jamie Gallagher. I'm a nationally board-certified family nurse practitioner, Menopause Society certified practitioner, and owner of Perimenopause, a midlife women's healthcare practice serving women in North Carolina, and I'm so glad you're here.

On our last show, we dove deep into estrogen or estrogens and talked about what they do and how they help our body function and what happens during the perimenopause transition that's impacted by that change. Today's topic is our hormone progesterone, another of the hormones that changes during this same midlife transition.

We tend to think of progesterone as a pregnancy hormone, and it's not just the pregnancy hormone. most of us learned that progesterone was the hormone that just shows up after ovulation and helps you stay pregnant. True, but that's just a tiny slice of what it does.

Progesterone is also working on your brain, your sleep, your mood, your uterus, your breast tissue, and even your bones. So today, we're gonna give a little tour everywhere in the body that progesterone actually works, what happens as it changes during perimenopause, and then we're gonna clear up one of the most confused topics in this whole field, the difference between progesterone and something that sounds like it but is not it, progestin or progestogens.

That mix-up is actually a big part of why hormone therapy got such a bad reputation, so let's get on into it. Just like we talked about with estrogen, progesterone doesn't have one job either. It has receptors, those little docking stations we talked about last time. They're sitting in the tissue all over your body.

Your brain has them, uterus, breast, bone, and others. Here's what makes progesterone a little different from estrogen, though. It's really kind of the calming, balancing hormone of the two. If estrogen is the one revving things up, building tissue, driving growth, progesterone is largely the one applying the brakes and keeping things, uh, more steady.

That balance between the two is a big part of why so many symptoms show up specifically when that ratio gets thrown off, not just when levels are simply high or low. let's clarify a term that is used often, estrogen dominance. What that means is really kind of a low progesterone state in a real sense.

Progesterone is the first hormone that wants to be less in the game, and this is what causes symptoms primarily in early perimenopause, that poor sleep, mood changes, irritability, little new onset anxiety. Let's walk through how and where that actually works. So first off, in your brain and during your sleep, this is probably the most underrated thing progesterone does.

Your body converts progesterone into a byproduct called allopregnanolone, and that acts on the same calming brain receptors that anti-anxiety medications target. So in plain terms, progesterone has a natural, built-in calming and sedating effect. It can help you fall asleep, it helps you stay asleep, and can help take that edge off of anxiety.

So this is exactly why when progesterone drops during the days, especially right before your period or, you know, or later during perimenopause, so many women notice anxiety spiking, irritability creeping in, sleep falling apart. It's not just stress. There's a really, a, a genuine hormone mechanism behind it.

So, um, let's move to the uterus. This is a job most of us already know. Progesterone balances out estrogen's effect in the lining of your uterus. Estrogen tells that lining to build up, thicken, build up, thicken, and progesterone tells it, "Stop building and get ready to either support a pregnancy or shed," normally as a period.

Without enough progesterone to balance the estrogen, that lining can keep building thick, you know, thickening unchecked, which is why women who still have a uterus and take estrogen therapy need a progesterone, a progestin of some sort alongside of it. That protects the uterine lining from continuing to grow.

This is also why irregular or heavy periods are one of the earliest signs of perimenopause, because as that progesterone starts dropping before the estrogen does, that balancing act gets kinda thrown off. So your breast tissue. Progesterone and estrogen both act on breast tissue, and the relationship is generally more complex than a lot of headlines suggest.

Progesterone influences breast tissue growth and cell turnover across the menstrual cycle, which is why the breast can feel tender or swollen in the days before a period. We'll come back to the breast tissue in a minute because it's central un- to the confusion we're gonna clear up, in the fourth segment of this.

So your bones. Like estrogen, progesterone also plays a supportive ro- role in bone health. It appears to help stimulate the cells that build new bone, working alongside estrogen rather than instead of it It's a smaller piece of the bone story than estrogen, but it's definitely part of the picture. So your mood, kind of more broadly when we talk about your mood.

Beyond the calming and sleep-related effects, progesterone interacts with mood-regulating brain chemistry more broadly. This is a big reason why some women feel noticeably different, more anxious, more irritable, more emotionally reactive in the second half of their cycle, and why that same pattern intensifies during perimenopause.

Lots of women will say to me, "Well, instead of having like PMS symptoms for two days, I have these symptoms for half of the month." So brain, sleep, uterus, breast tissue, bones, mood, a hormone with a real job list well beyond pregnancy. So what will you actually notice and when? So here's the pattern a lot of women go through, though again, everyone's timeline's a little different.

Every month in a regular cycle, progesterone rises after ovulation and falls right before your period. That drop is why the premenstrual syndrome mood symptoms exist. Anxiety, irritability, breast tenderness, sleep trouble a lot of women have in the days right before their period begins is the progesterone leaving the building.

In early perimenopause, something specific happens. Like we said, progesterone tends to drop before estrogen does because ovulation start be- starts becoming less consistent, so you end up with a stretch of time where estrogen is still relatively normal or even fluctuating higher, but progesterone isn't there to balance it out anymore.

This is often when women will first notice heavier or unpredictable periods, worsening premenstrual syndrome-type mood symptoms than they've ever had, new sleep problems, and anxiety that feels much more disproportionate to what's actually going on in their life.

A lot of women describe this specific window as feeling like undiagnosed PMDD, or premenstrual dysphoric disorder, which is a significantly more profound, um, symptom profile than just PMS, and that's generally one of the most under-recognized parts of this whole transition. Oftentimes in early peri, we give just progesterone, literally the bioidentical progesterone. It's called micronized progesterone, brand name Prometrium. These symptoms improve with just simply adding progesterone to a woman in early perimenopause. Later, you get cl- later as you get closer to and past your final period, progesterone settles at a low, steady level along with estrogen.

Some of that acute anxiety and sleep disruption can actually ease once things stabilize at a new low baseline, even though estrogen-related symptoms like hot flashes may still be present. But the big takeaway here is progesterone dropping first ahead of estrogen is a big part of why perimenopause can feel so destabilizing, even when periods are technically still happening fairly regularly.

So let's talk about the difference between progesterone and progestin, and this is kind of the mix-up that mattered. So this has caused confusion, honestly, and a lot of unnecessary fear. Progesterone and progestins, they sound like the same word, but they're not the same thing. Progesterone is the molecule your body actually makes, and when you take a prescription version of that that's chemically identical to what your body produces, it's usually-- or it's called micronized progesterone.

You may know that again by the brand name Prometrium. A progestin is different. It is a synthetic lab-made molecule designed to act somewhat like progesterone in the body, mainly to protect the uterus, but it isn't structurally the same, so it doesn't behave identically once it's in your system. So medroxyprogesterone acetate, often called MPA by the brand name Provera, is the most well-known example, and here's why that distinction actually matters for a conversation we've already had on this show.

The original Women's Health Initiative study, the one behind the black box warning about the estrogen episode, um, used a synthetic progestin, MPA, combined with a specific oral estrogen. It did not use micronized progesterone, but for two decades, a lot of the fear generated by that study got applied broadly to hormone therapy and even progesterone as a whole when the actual product studied was a specific synthetic progestin paired with a specific estrogen formula. Since then, a growing body of research has looked at whether micronized progesterone behaves differently than synthetic progestins in the body, particularly around breast tissue, heart effects, and a lot of that research suggests it may carry a more favorable profile in some of those areas.

This is part of why you'll hear many menopause specialists specifically prescribe micronized progesterone rather than a synthetic progestin when it's clinically appropriate. And I wanna be really careful here, the same way we were careful with the estrogen conversation. This isn't progesterone good, progestins bad.

It's, it's not. It's not that simple. Progestins are still effective, still widely used, and still the right choice in certain situations. But the word mix-up between progesterone and progestin has genuinely muddied a lot of the public conversation, and untangling which one a study or a warning label was actually talking about is one of the most useful things you can do as an informed patient.

So that's progesterone. Not just the pregnancy hormone, but your body's built-in calming agent, your uterine lining's balancing partner, and a molecule that's genuinely different from its s- synthetic cousin. Say that a couple times real fast. The progestin in ways that matter. Brain, uterus, breast tissue, bone, mood, All tuned into this hormone, all shifting as it rises and falls across your cycle and eventually through perimenopause. Thanks so much for joining in and listening. I hope this helps in understanding progesterone and what it does. If you found this episode helpful, please share with your friends, sister, coworkers, partners, anyone you think might find it helpful also, and we'll see you on our next show.

[00:10:22] Speaker 5: Thanks for listening. If this episode helped you feel more informed or less alone, please subscribe, leave a review, and share it with another woman who needs this information. You can also follow us on social media for more education and updates at facebook.com/perryandpause and Instagram at perry.and.pause.

Until next time, take good care of yourself. The information shared on the Perry and Pause podcast is intended for informational and educational purposes only and should not be considered medical advice, diagnosis, or treatment.