Perimenopause Symptoms at 40: You Are Not Imagining It

Hormones & Thyroid · Minnetonka, Minnesota

Perimenopause at 40: You Are Not Imagining It

By Alicia Hickson, MSPAS, PA-C · Certified Functional Medicine Practitioner · Founder, Rayma Health

Perimenopause is the span of years before your last period when the hormones start to shift, and for most women it begins in the early-to-mid forties, not at fifty. The first hormone to go is not estrogen. It is progesterone, and it leaves while estrogen is still swinging up and down. That one fact explains most of the early picture.

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The Short Version

What is actually going on, in three steps

If you are 43 or 46 and someone has told you that you are too young for this to be hormones, you are not too young. Waking at 3 a.m., periods closer together or heavier, an edge of anxiety that was not there before, and weight landing at your middle on a diet that has not changed: this is perimenopause, and there is a pattern to it.

1

Progesterone goes first

You only make real progesterone in the two weeks after you ovulate. In your forties, more cycles skip ovulation or do it weakly, so progesterone drops long before estrogen does.

2

Estrogen swings

It does not fall quietly. In the early years it holds, or runs high, while progesterone is gone. That one-two is what breaks sleep, sharpens mood, and changes your cycle.

3

Your metabolism shifts

Deep belly fat rises, fat burning drops by about a third, and muscle begins to decline in the same window. That is why the scale moves on a diet that has not changed.

This Is a Season

And it is a real one

The largest American study of the menopause transition followed more than three thousand women for seventeen years. Among the women who had frequent hot flashes and night sweats, more than half had them for over seven years. Women whose symptoms started early, while they were still having regular periods, had the longest run of all, often more than a decade.

The same study tracked sleep. Trouble falling asleep and trouble staying asleep both climbed as women moved through the transition, and they tracked with the hormone changes themselves, not just with age.

I share those numbers for one reason. So you stop waiting for this to blow over in a few months, and so you stop wondering whether it is all in your head. It is in your hormones, and hormones can be worked with.

The early picture

Progesterone is your calming hormone. It helps you sleep through the night, steadies mood, and keeps the lining of the uterus from building up too thick. Take it away while estrogen is still swinging and you get all of this at once:

• Waking at 3 a.m.
• New anxiety or irritability
• Sore breasts
• Periods arriving sooner and heavier
• Night sweats that come and go

Does This Sound Like You

What women tell me in the first five minutes

Wide awake at 3 a.m. Periods closer together Heavier bleeding Anxiety that is new Weight at the middle Night sweats Sore breasts before a period Brain a half-step slow “Too young for this” Normal labs, still not yourself

Hormones that swing cannot be caught by one blood draw. A normal result on a Tuesday does not tell me what Friday looked like. That is why the guidelines say not to use an FSH test to diagnose perimenopause in women over 45. The diagnosis is made from your symptoms and your cycle pattern; hormone numbers only back it up.

Starting This Week

Three things to do

None of these cost anything. They are the foundation everything else sits on.

01

Track the pattern for two months

The day your period starts, how heavy it is, the nights you wake, the days you feel the edge, any flashes or sweats. A notebook or the notes app is fine. Two months of this tells me more than one blood test ever could, because the pattern is the diagnosis.

One exception, and it is the one real caution here: soaking through a pad or tampon every hour for a couple of hours, bleeding more than seven days, or periods less than three weeks apart is a visit, not a log. After 45, that kind of bleeding gets the uterine lining checked, not assumed.

02

Put protein first, and pick up something heavy

Muscle is the organ that burns fuel, and this season quietly takes it. A palm-sized portion of real protein at every meal, breakfast included. Two or three days a week, lift something that feels heavy by the last few reps: weights, bands, your own body. Across a hundred trials in women past the change, training rebuilt muscle and trimmed deep belly fat, and lifting did the most for muscle.

Exercise does not reliably stop hot flashes. What it does is protect the muscle, bone, and blood sugar this season is working against. That is the reason to do it.

03

Protect the night

With less progesterone on board, your sleep has less margin, so give it some back. A cool room. Lights down after dinner and the phone charging somewhere else. The same bedtime most nights. And the one nobody loves to hear: alcohol in the evening makes the second half of the night worse. It helps you fall asleep and then breaks sleep up after midnight, and women who drink heavily report more hot flashes, night sweats, and low moods.

If the anxiety or the low mood has become the loudest symptom, say so. What you carry emotionally shows up in your body, and I treat it as part of the plan, not an extra. You do not have to carry it alone.

What I Reach For

Three things, each with a reason

There is a reason for every one of these, and I do not start any of them without knowing your pattern first.

Bioidentical progesterone at bedtime

If progesterone is the hormone that leaves first, the most direct answer is to give it back, in the same form your body makes, taken at night when it does its best work. In a placebo-controlled trial of women past menopause, it cut hot flashes and night sweats. It is also what protects the uterine lining when estrogen is running unopposed.

It can make you drowsy, which is why it is taken at bedtime. If you take thyroid medication, I recheck your thyroid labs after starting it, because progesterone nudges free T4 up a little.

Magnesium glycinate

Magnesium runs hundreds of everyday reactions, and a lot of women in this season are quietly short on it. Stress burns through it, and so do coffee, alcohol, and several common medications. It shows up as tight muscles, cramps, constipation, and a racing mind at bedtime. I use it for the wired-and-tired nights and the tight body, and I check red blood cell magnesium rather than the standard serum test, which can look normal while your tissues are low.

If you have kidney disease, ask before starting it. Keep it a few hours apart from thyroid medication.

Ashwagandha root extract

The herb I turn to when the stress of the season is piling on top of the hormones. In a placebo-controlled trial of perimenopausal women, eight weeks of ashwagandha root extract lowered the overall menopause symptom score meaningfully more than placebo, with mood, physical, and urogenital symptoms all improving, and women rated their quality of life higher.

Two cautions, with the monitoring that makes it safe: it can push the thyroid toward overactive, so I check thyroid labs before and after in anyone with a thyroid condition; and in a small number of people it has irritated the liver, usually a few weeks in, so itching, dark urine, or yellowing of the eyes means stop it and message me the same day. Not with existing liver disease, and not in pregnancy.

Test, Don’t Guess

What I usually run

One FSH on one morning can read “normal” in the middle of full perimenopause, because the level swings from week to week. I want the pattern, not a snapshot. And when we do test, I want the test that shows how your body is handling its hormones, not just how much is floating by.

• The DUTCH testA dried-urine test you collect at home across a day, and across a cycle if you are still cycling. It shows your progesterone, your estrogen and which pathways your body uses to clear it, and your cortisol curve from morning to night, in one picture. Four at-home samples match a full 24-hour collection, and the estrogen and progesterone results track with blood.
• Fasting insulinThis is the window when blood sugar and belly fat start to move, years before a glucose number does.
• Ferritin and ironHeavier periods drain iron, and low iron feels like exhaustion, hair loss, and a brain that is a half-step slow.
• A full thyroid panelIt produces the same tired, foggy, cold picture, and the two often travel together.
• Vitamin D and RBC magnesiumThe two I most often find low, and the two easiest to fix.

Not everyone needs every one of these. What I order depends on your story and your log. That is what the visit is for.

How a hormone workup goes at Rayma Health

• Your log first. Two months of cycle, sleep, and mood notes. Bring what you have, even if it is one month.
• An hour, not fifteen minutes. Your history, how you are really doing, and the whole picture, body, mind, and spirit.
• The right tests, with a reason. DUTCH when the pattern needs explaining, plus the blood panel above.
• A plan you understand. Food, sleep, lifting, and the one to three things worth taking, each with its why.

Telehealth across Minnesota, and in person in Minnetonka.

Questions I Hear Most

Frequently asked questions

Can perimenopause start at 40?

Yes. Daily hormone measurements put the shift as early as 43, and symptoms can start while periods are still regular. In the national cohort, women whose hot flashes began that early had the longest course, often more than a decade.

What are the first signs of perimenopause?

Usually the progesterone signs: waking in the night, new anxiety or irritability, sore breasts, and periods that arrive sooner or heavier. Hot flashes often come later, once estrogen starts to fall.

Why do I wake up at 3 a.m. in perimenopause?

Progesterone is a calming, sleep-supporting hormone, and it is the first one to drop. With less of it, sleep has less margin, and night sweats and alcohol both break up the second half of the night.

Can a blood test diagnose perimenopause?

Not reliably. FSH and estrogen swing from week to week, so a single draw can read normal in the middle of full perimenopause. The guidelines say to diagnose it from symptoms and cycle changes in women over 45, which is why I ask for a two-month log before I order anything.

What is the DUTCH test and is it worth it?

A dried-urine hormone test collected at home over a day. Its four samples match a 24-hour collection and its estrogen and progesterone results track with blood, and it adds what blood does not show: how your body is clearing estrogen and the shape of your cortisol curve. I use it when the pattern needs explaining.

Does exercise help perimenopause?

It protects muscle, bone, and blood sugar, all of which this season works against, and lifting does the most for muscle. It does not reliably reduce hot flashes, so do it for the muscle, bone, and blood sugar.

Is progesterone safe in perimenopause?

Bioidentical oral progesterone at bedtime is the same molecule your body makes, and in a placebo-controlled trial it reduced hot flashes and night sweats in women past menopause. It can cause drowsiness, which is why it is taken at night, and anyone on thyroid medication gets a recheck of thyroid labs after starting it.

Alicia Hickson, MSPAS, PA-C is a board-certified physician assistant, Certified Functional Medicine Practitioner, and the founder of Rayma Health in Minnetonka, Minnesota. She trained in metabolic oncology under Dr. Thomas Seyfried and in Nasha Winters’ MAPC program, and is Bredesen-certified for cognitive decline. She treats complex chronic illness as a whole person: body, mind, and spirit.

More about Alicia · Medically reviewed by Alicia Hickson, MSPAS, PA-C · October 2026

Sounds like your last six months?

Let’s look at the whole picture.

Your pattern, your labs, and a plan that fits you. A hormone workup at Rayma Health starts with your two-month log and ends with a plan you understand.

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Educational content, not individual medical advice. Every plan at Rayma Health is built from your own history, labs, and goals.

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