Perimenopause vs. Menopause: What's the Difference and What's Happening to Your Hormones?

We've all heard someone say, “She's going through menopause,” or “I'm menopausal.” Hell, we've even heard healthcare providers say, “You're going through menopause.”

But what actually is menopause?

How long does it last?

When does is start?

What does it mean?

There's a LOT of confusion around this.

One day you have a period, the next you're officially “in menopause,” and suddenly everything is supposed to make sense??? Not exactly. So let's clear some things up.

Menopause is a natural biological transition that marks the end of a woman's reproductive years. But here's the part that gets confusing: the hormonal changes associated with menopause can begin years before your final menstrual period, and those changes can affect far more than your menstrual cycle.

What Is Menopause?

Technically, menopause is when you've gone 12 consecutive months without a menstrual period, assuming there isn't another explanation for the absence of your period. That 12-month point marks the end of natural menstruation and reproductive potential.

So menopause itself isn't a phase that lasts 5 or 10 years. It's a point in time. A single day. Think of it as your 1-year anniversary without a period.

TEN years leading up to that point are called perimenopause.

What Is Perimenopause and How Long Does It Last?

Perimenopause is the transition leading up to your final menstrual period. For many women, it lasts up to TEN YEARS, although the timing varies significantly from woman to woman.

I call perimenopause the Wild West of hormones because things can get unpredictable.

Ovulation becomes less consistent. Estrogen and progesterone can fluctuate significantly, your cycle can change, symptoms can come and go, you may feel completely normal one month and wonder what the hell happened the next.

And this is often when women hear:

“You're too young to be going through menopause.”

Except you're not actually be in menopause. You're in perimenopause.

Those are not the same thing.

And understanding that distinction matters because the hormonal transition can begin well before your final period. Please seek out a hormone specialist during this time to get support!

What Happens to Your Body During Perimenopause?

During your reproductive years, your ovaries produce estrogen and progesterone and, when ovulation occurs, release an egg. Your hormones naturally fluctuate throughout every menstrual cycle. That's normal. As you approach menopause, however, ovarian function becomes less predictable. Ovulation becomes less consistent and hormones fluctuate more dramatically, and over time ovarian hormone production declines.

This doesn't necessarily happen in a neat, predictable pattern. It's not always a nice, orderly progression where your hormones gradually decrease a little bit every year. You may have months where you feel completely normal followed by a month where your sleep is terrible, your mood is all over the place, your period shows up early or late, or you suddenly feel like your body has changed overnight.

Your periods may become shorter or longer, heavier or lighter, more or less frequent, more unpredictable, or occasionally skipped. And you may begin experiencing symptoms that don't seem to have anything to do with your period.

That's one of the reasons perimenopause can be so frustrating. You know something has changed, but you just don't always know what the hell is going on.

Common Symptoms of Perimenopause and Menopause

Every woman experiences this transition differently. Some women have relatively few symptoms. Others experience changes that significantly affect their daily lives. Symptoms can include hot flashes and night sweats, changes in menstrual cycles, sleep disturbances, fatigue, mood changes, increased anxiety or irritability, brain fog or difficulty concentrating, changes in libido, vaginal dryness or discomfort with sex, changes in body composition, changes in muscle mass and strength, headaches or migraines, joint and muscle aches, changes in skin and hair, urinary symptoms, but the list goes on and on. Some women don't describe their experience as a specific symptom at all.

They simply say:

“I don't feel like myself anymore.”

What Happens to Your Hormones During Perimenopause and Menopause?

Why Does Estrogen Matter?

Estrogen isn't just a reproductive hormone. Estrogen receptors are found throughout the body, including the brain, bones, cardiovascular system, and reproductive and genitourinary tissues.

As ovarian estrogen production changes during the menopausal transition, women can experience changes across multiple areas of health. This is why reducing menopause to hot flashes doesn't tell the whole story. Your hormones are part of a much larger physiological system and menopause isn't just about losing your period.

Progesterone

Progesterone.. Ahhh good ole progesterone. You would have to pry mine from my cold dead hands. Progesterone changes during perimenopause as well, but so many women are deficient in it well before peri. (I wont get into this here - but heavy bleeding, heavy clotting, cramping, and major mood swings with PMS clues a hormone specialist into a progesterone problem.)

One of the important changes during the transition is that ovulation becomes less consistent. When ovulation doesn't occur, the normal post-ovulation rise in progesterone doesn't occur either.

That can contribute to changes in menstrual bleeding and may be associated with symptoms such as mood changes and sleep disruption in some women.

Testosterone?

Yes, women produce testosterone too. NO, IT WON'T TURN YOU INTO A MAN.

Testosterone is produced by the ovaries and adrenal glands and plays a role in sexual function, muscle and bone health, and other physiological processes. Testosterone levels generally decline with age, but that decline shouldn't simply be attributed to menopause itself and 'there's nothing to do about it' mentality. Healthy testosterone levels in women often restore sex drive, energy, mood, and motivation.

How Is Perimenopause and Menopause Diagnosed?

For many healthy women in their 40's who have typical symptoms and menstrual changes, menopause and perimenopause can often be identified based on symptoms and menstrual history along with lab monitoring.

But there are situations where determining reproductive stage is more complicated.

What if you don't have periods?

What if you've had an ablation?

What if you've had a hysterectomy but your ovaries remain?

What if your cycles have always been irregular?

What if you're younger than the typical age range?

What if your symptoms could also be explained by thyroid dysfunction, nutritional deficiencies, medications, sleep problems, metabolic issues, or another medical condition? This is where a comprehensive evaluation becomes important.

At ANU Wellness, we look at the whole picture: your symptoms, health history, menstrual and reproductive history when available, laboratory data when clinically appropriate, thyroid and metabolic health, lifestyle, medications, and your individual goals.

What Is the Average Age of Menopause?

For the average woman, natural menopause occurs around age 51, but there is a wide range of normal. I've diagnosed women who were postmenopausal in their 40s, and I've seen women at age 53 trucking along with a regular period.

If you're trying to understand where you are in this transition, seek out a hormone specialist who can look at your individual picture and provide treatment solutions rather than simply telling you, “You're just at that age, suffer through it.”

Can Perimenopause and Menopause Symptoms Be Treated?

Menopause itself isn't a disease that needs to be cured, but symptoms associated with the menopause transition absolutely can be addressed. And for appropriate women, bioidentical hormone therapy can be used to replace hormones that have declined and restore some of the physiological effects those hormones provide. Hormone therapy can be an effective treatment for bothersome vasomotor symptoms such as hot flashes and night sweats, certain genitourinary symptoms, long-term health, and many other symptoms you may not even attribute to this transition.

Bioidentical hormone replacement therapy can be a fantastic option for so many women. The decision to use hormone therapy should be individualized based on your symptoms, medical history, benefits, and goals. We cover all of this in your initial consultation: which hormones? what route? what dose? are there contraindications? what symptoms are you actually trying to address? what else could be contributing?

This is not a one-size-fits-all situation.

The Bottom Line: Menopause Is a Point in Time, Not a Decade-Long Event

Menopause isn't some decade-long event. Menopause is a point in time - one day, think of it as your 1-year anniversary of no bleeding.

The years leading up to it are perimenopause, and that's where many of the confusing hormonal changes and symptoms begin. Your cycle will change, hormones will fluctuate, your sleep may change, your mood may change, body composition may change, and our libido may change.

Sometimes, the only thing you can really say is: “I don't feel like myself anymore.”

You don't have to dismiss significant changes as something you're simply supposed to tolerate because you're getting older. You don't have to take the generic advice of “Welcome to being a woman. This is your new normal.” Or: “You're just at that age.”

Understanding what's happening is the first step and know that normal doesn't always mean optimal.

At ANU Wellness, we take a comprehensive approach to hormone and metabolic health, looking beyond a single symptom or lab value to understand the individual as a whole.