Estrogen Dominance: what could really be behind PMS, hormone chaos and the feeling of being a stranger in your own body.

You function. But something is not right.

I bet you know this feeling.

Not sick enough to be really sick. But also not well enough to be really well. You get up in the morning and ask yourself why, after eight hours of sleep, you still feel as if you had not slept at all. Why your belly bloats every other week like yeast dough. Why your breasts ache so much that you cannot lie on your side at night. Why on some days you are your own best friend, and three days later you cannot bring up any understanding for the same people.

You went to the gynecologist. She measured. She nodded. She said: everything within the normal range. And you went home, somehow relieved. And somehow even more frustrated than before.

Because you know: there is more.

Let me tell you something you have probably never heard quite like this:

Your body does not lie. It is sending you very clear signals all the time. The problem is not your body. The problem is that most measurements are too coarse to see what your body is trying to tell you.

And the other thing I want to tell you, before we begin: You are not crazy. You are not dramatic. And what you are experiencing has a biochemical explanation. One that we are going to look at together. Without jargon. Without panic. But with real depth.

1. The ratio. Not the value.

Okay, let us start with what most people misunderstand, and indeed before they even know what estrogen dominance is.

Estrogen dominance sounds as if you have too much estrogen. Sometimes that is true. But mostly it is much more subtle. And much more interesting.

Imagine two musicians who are supposed to play a piece together.

Estrogen is the violin: loud, alive, brilliant, full of energy. Progesterone is the cello: warm, grounding, calm, the anchor. When the violin plays too loud, no beautiful piece arises. But the problem can also be that the cello is simply too quiet. It is not the violin playing wrong, it is the cello that is missing.

Estrogen dominance is almost always a problem of the cello. Not a problem of estrogen alone.

What estrogen really is, and why it is wonderful

Estrogen is not your enemy. Estrogen makes you alive. It builds up the endometrium, protects your bones, keeps your joints supple, makes your hair full and your skin radiant. It lifts your energy in the first half of the cycle. It is the reason you sometimes have weeks where you feel like you have everything in hand.

Estrogen rises in the first half of the cycle, the so-called follicular phase, up to ovulation. That is its job. That is beautiful. The problem begins when, after ovulation, the counterweight does not come.

Progesterone: the hormone without which you cannot really recover

Progesterone is the hormone of the second half of the cycle. It is produced in the corpus luteum, that is, in the tissue that arises after ovulation from the ruptured follicle. And here comes the decisive part, remember it:

No ovulation. No corpus luteum. No progesterone.

It is that simple. No supplement in the world can compensate for this as long as ovulation does not happen.

Progesterone does not only act in the uterus. In the brain a part of it is converted to allopregnanolone. This is what is called a neurosteroid, it activates the GABA system, the most important calming system of your nervous system. The body's own relaxation switch. When progesterone is missing or falls too early, you lose this switch. Sleep becomes shallower. Stimuli feel stronger. Mood swings explode. Inner restlessness comes out of nowhere.

What you call PMS? That is not weak nerves. That is neurobiology. That is measurable. That has a name.

2. Why your lab result still does not tell you what is going on

You went to the doctor. Everything is normal. But you are not normal.

I do not say that harshly. I say it with full respect for what you are going through. But I hear this sentence so often: everything is normal. And the woman sits across from me and looks at me as if I had just told her she was imagining all of this.

Here is the truth: hormones are not static numbers. They are a story that unfolds over the entire month. A single value tells you about as much as if you looked out the window once and claimed to know what the weather was like for the past month.

The timing problem

Progesterone measured on day 14 tells you almost nothing meaningful. Because on day 14 you are at ovulation, where progesterone is physiologically still hardly present. Progesterone belongs in the luteal phase, ideally around day 19 to 22 of a 28-day cycle. If it is measured there and is low, that has weight. If it is measured at the wrong time, that tells you: nothing.

I have seen patients who were sent home for years with "everything okay", because their progesterone was measured at the wrong cycle phase. The timing was wrong. Not their body.

The ratio problem

Imagine that estrogen has had five glasses of wine tonight. Progesterone has had only one glass. Both values are "normal". But the effect in the body is that of someone coming home drunk, because the ratio is off.

Exactly that happens in the body. Estrogen can be within range, progesterone too, and yet the ratio of the two can be so out of balance that all the PMS symptoms are there. The lab does not see this when only individual values are looked at.

The xenoestrogen problem

And then there is something that no standard lab measures: foreign substances that behave like estrogen. Xenoestrogens from plastic, from mold toxins, from cosmetics, from certain foods. They bind to your estrogen receptors, activate hormonal signaling chains, raise the estrogen-like total effect in your body. But they do not appear as estradiol in the blood panel. They are invisible in the standard test.

That is why a woman can have perfect lab values and still have severe symptoms. Because what is burdening her is simply not measured.

The CGM idea: making visible what is invisible

In my practice I sometimes use a continuous glucose monitor (CGM), a small patch on the arm that shows at every moment how blood sugar reacts to every meal. Why am I telling you this here?

Because it is the same principle as with hormones: the snapshot in the resting state shows nothing. The curve over time shows everything. I wish we had the same tool for hormones. Until then, we need cycle-appropriate measurements, the right panel and the right timing.

3. Cortisol: your body cannot make alarm and progesterone at the same time

Stress is no excuse. Stress is biochemistry. And this biochemistry could have been sabotaging your hormone life for years.

I will show you why in a moment. But first an honest conversation about the word stress.

When I ask patients whether they are stressed, many say: "No, I am actually relaxed." And then they tell me about 55-hour work weeks, children who have to be made ready in the morning, sleep under seven hours, the feeling of never really winding down, and an inner monologue that keeps running at 11 in the evening. That is stress. Even if you do not experience it as such.

The pregnenolone fork: where progesterone could be stolen

Cortisol and progesterone share a common precursor. It is called pregnenolone. Imagine pregnenolone as a budget that the body has to allocate to two expenses: progesterone or cortisol.

In normal operation there is enough for both. But under chronic stress the body shifts. It preferentially routes resources to cortisol production. We call this pregnenolone steal. The progesterone budget shrinks. And you ask yourself why everything falls apart in the luteal phase.

The HPO axis: when the brain no longer gives the order

Chronically high cortisol levels could moreover inhibit the higher-level control center of the hormone system: the hypothalamic-pituitary-ovarian axis. HPO axis for short.

This is how it works in the normal state: the hypothalamus (a region in the brain) gives the start signal with GnRH. The pituitary releases LH and FSH. The ovaries produce estrogen and progesterone. A precise, wonderful system.

Under chronic stress, cortisol could dampen these GnRH pulses. Less GnRH means less LH. Less LH means: weaker ovulation. Weaker ovulation means: a poorer corpus luteum. A poorer corpus luteum means: less progesterone. The cello falls silent.

The most insidious thing: your nervous system knows no difference

The saber-toothed tiger back then. The presentation tomorrow morning. The 57 unanswered emails. The child who does not sleep at night. For your nervous system, alarm equals alarm. It releases cortisol without asking questions.

That was once brilliant, because the saber-toothed tiger was gone after a few minutes. The problem today: the alarm runs continuously. Not for minutes. For months. For years. And at some point the system starts to save. And it saves first on things that are not about survival. Reproduction, for example.

4. Blood sugar: the silent saboteur almost no one has on the radar

May I ask you an uncomfortable question?

What did you eat for breakfast this morning? Oats with fruit? Toast? Coffee and then nothing for a while?

I am not asking to shame you. I ask because in my practice I keep experiencing the same surprise: a woman who considers herself to eat well wears a blood-sugar sensor for three days, and then we sit together and look at the curves. And the curve looks like a rollercoaster ticket.

What does this have to do with hormones?

Everything. Because when blood sugar rises, the pancreas releases insulin. Insulin is no evil hormone, it is essential for life. But chronically elevated insulin levels could affect several hormonally relevant processes, and indeed at the same time.

First: insulin could activate aromatase. This is an enzyme that sits in fat tissue and converts androgens to estrogen. More insulin, more aromatase activity, more estrogen from your fat tissue, and that completely independent of what your ovaries are doing.

Second: chronically high insulin levels could disturb ovulation. In PCOS exactly this mechanism is well documented.

Third: when blood sugar crashes after a spike, your body reacts with cortisol as counter-regulation. And cortisol, as we have already discussed, could inhibit progesterone synthesis.

A single wrong breakfast therefore sets off a cascade: blood-sugar spike, insulin spike, aromatase activation, cortisol peak, dampened ovulation, less progesterone. Every morning. Over years.

5. Your gut helps decide. Every night. Without your knowledge.

Here comes something most women have never heard, although it could have a huge influence.

The liver is a wonderful organ. It packages excess estrogen, attaches a kind of tag to it that says: please excrete. This packaged estrogen reaches the gut via bile. It is meant to leave with the stool.

But then your gut residents come along. Billions of bacteria. And some of them produce an enzyme called beta-glucuronidase. This is the little saboteur that tears the tag back off the packaged estrogen. The estrogen is set free. And because the gut absorbs everything floating freely in it, the estrogen ends up back in the bloodstream.

This is no error. It is a system known as the "estrobolome", the hormonal recycling of the gut. With a healthy gut flora it is in balance. With dysbiosis, that is, an imbalance of gut bacteria, this recycling could become excessively active. Too much estrogen returns. The ratio tips. Your body turns up.

The liver: much more than a detoxification station

The liver is no trash bin into which you throw everything and hope that it somehow disappears. It is a highly precise metabolic organ that actively paces estrogen breakdown over two biochemical phases.

In phase 1, estrogen is converted into various metabolites. These can be harmless or problematic, depending on which path is preferred. In phase 2 the metabolites are made water-soluble for excretion. When the liver is under pressure from alcohol, chronic sleep deprivation, too many processed foods, heavy metals or mold toxins, phase 1 could stall. Estrogen metabolites accumulate. Some of them could themselves be hormonally active.

What could help the liver: brassicas like broccoli, cauliflower and Brussels sprouts contain indole-3-carbinol and DIM. These substances could steer estrogen metabolism into a more favorable path. Furthermore, the liver does its most important regenerative work at night. Bad sleep is bad liver management. And bad liver management could be hormonally expensive.

6. Xenoestrogens: when your environment burdens your hormone system

Now comes the part that first makes some people incredulous. And then frightens them.

Imagine that someone sneaks into your apartment, sits down in the seat of your partner and behaves as if he were your partner. The seat is taken. The signals run through. But it is not the right person. The system reacts anyway.

That is exactly what xenoestrogens do in your body. They bind to estrogen receptors and activate hormonal signaling chains, without appearing as estrogen in the blood panel. The standard lab does not measure them. They are invisible. But they act.

BPA and phthalates: plastic that disguises itself as a hormone

BPA is a component of polycarbonate plastics. It is found in plastic bottles, canned foods, thermal till receipts (taken in through skin contact), some dental materials. Its chemical structure resembles estradiol, the most active body-own estrogen, so strongly that it can bind to estrogen receptors.

Phthalates are plasticizers in PVC products: cosmetics, perfumes, shampoos, plastic packaging. Their breakdown product MEHP could trigger oxidative stress in follicle cells and impair follicle maturation. Every time you drink from a plastic bottle in a hot car, you take in plasticizers. Every time you touch a thermal receipt, your skin takes up BPA.

Zearalenone: the mold substance that looks like estrogen

This is one of the most fascinating and frightening findings of modern hormone research.

Zearalenone (ZEA) is a mold-fungus toxin. It is formed by Fusarium mold that grows on grains: corn, wheat, oats, barley. It is heat-stable. It survives cooking and baking. It ends up in your bread, your muesli, your beer.

And its chemical structure resembles 17-beta-estradiol so strongly that it can bind competitively to estrogen receptors. In livestock farming, the effect has been known for decades: ZEA triggers hyperestrogenism in animals, disturbs the cycle, inhibits ovulation, can cause infertility. In veterinary medicine ZEA has a fixed name: mycoestrogen.

7. Mercury and amalgam: when a dentist visit could change hormones

What I am about to tell you sounds far-fetched to some at first. Please read it through to the end anyway.

Mercury is a fascinating and frightening substance. It is the only metal that is liquid at room temperature. And once it enters the body, it behaves like a system hacker: it preferentially deposits itself in endocrine organs. In the thyroid. In the pituitary. In the ovaries.

Where does mercury in the body come from?

The most common sources in everyday life are amalgam fillings, also called "silver fillings". They consist of about 50 percent mercury. With chewing, with temperature differences, and in an acidic milieu, amalgam continuously releases tiny amounts of mercury vapor. Not dramatic, but steady. Over years. Over decades.

Added to this are deep-sea fish and seafood (especially tuna and swordfish), industrial exposures and certain occupational fields.

What mercury could do in the hormone system

Mercury binds with high affinity to sulfur groups of enzymes, that is its entry point. Among them are also selenoproteins, for example deiodinase. Deiodinase is the enzyme that converts inactive T4 to active T3, that is, to the thyroid hormone that actually acts in the cells. When mercury displaces selenium and blocks deiodinase, T4-to-T3 conversion could be disturbed. The result: lab values that look "normal", while at the cellular level too little active thyroid hormone arrives.

At the same time, high mercury burdens could trigger autoimmune processes via T-cell reactions that target thyroid tissue. Hashimoto after high mercury exposure is a clinically observed pattern, even if exact causality still needs further research.

8. The thyroid: the silent conductor of the hormone system

When women come to me with exhaustion, cycle disturbances and poor mood, I always also look at the thyroid. Always. Because it is so often overlooked and can trigger so much.

The thyroid produces T4 (thyroxine) and some T3. But most of the T3 your body needs is converted from T4 elsewhere: in the liver, the gut and other tissues. T3 is the active hormone. It is the gas pedal for cellular energy, for metabolism, mood, heart rate, body warmth.

Why thyroid and estrogen dominance could be linked

Thyroid hormones influence SHBG, the sex-hormone-binding globulin. SHBG is the transport protein that binds estrogen and testosterone in the blood and thereby inactivates them. With a thyroid underfunction (hypothyroidism), SHBG drops. What that means: more free estrogen circulates in the blood. At the same time, estrogen breakdown in the liver slows. Hypothyroidism could thus indirectly favor estrogen dominance.

And the other way around: high estrogen levels raise thyroid-binding globulin (TBG), another transport protein. More TBG means: less free T3 and T4 for the cells. The thyroid has to produce more to achieve the same effect. A self-reinforcing loop is possible. Estrogen dominance and thyroid problems invite each other in.

TSH alone is not enough

In standard diagnostics, often only TSH is measured. TSH is the higher-level commander from the pituitary. But a normal TSH does not exclude that too little active T3 arrives in the cells. For that one would need to know fT3, fT4 and anti-TPO antibodies.

I see women with TSH within range but fT3 at the lower edge, elevated antibodies and classical hypothyroidism symptoms. They were sent home for years. Their body was right, the measurement was too coarse.

Iron, selenium and the thyroid: the invisible triangle

The conversion of T4 to T3 by deiodinase needs selenium as a cofactor. Selenium scarcity is widespread in Germany. Mercury can displace selenium, as we just saw. And iron deficiency impairs thyroid peroxidase (TPO), the enzyme that synthesizes T4 and T3 in the thyroid in the first place.

Iron deficiency can therefore directly slow thyroid synthesis. Poor thyroid impairs hormone metabolism. Hormone metabolism affects everything else. And all of this sometimes begins with a ferritin value of 14 µg/L that the lab calls "normal".

9. Iron deficiency: the overlooked foundation, without which nothing functions

Ferritin at 12. "Normal according to the lab". Exhausted nonetheless.

I experience this regularly. A woman comes because of hormonal complaints. Her ferritin is 12 or 14 µg/L. The lab says: within range. I say: that explains a lot of what you describe.

Iron deficiency is the most common micronutrient deficiency worldwide. And women in the reproductive phase are especially affected, because menstruation costs iron. The problem: the ferritin threshold from which an official deficiency is declared lies in many German labs at 12 to 15 µg/L. From a physiological point of view, that is far too low.

How iron deficiency could hit your hormone system

Iron is a cofactor of thyroid peroxidase (TPO), the enzyme that incorporates iodine into active thyroid hormones in the thyroid. With iron deficiency, TPO could not be sufficiently active: less T4, less T3, worse conversion. With this the loop closes: iron deficiency impairs the thyroid, the thyroid affects SHBG and estrogen breakdown, and all of this together could favor estrogen dominance.

Furthermore, your mitochondria, the power plants of every cell, need iron for the respiratory chain. Exhausted mitochondria mean exhausted cells, exhausted hormone production, exhausted you.

What I consider functionally favorable

Ferritin above 50 µg/L is my orientation value for women with symptoms. Below 30 µg/L I treat, even without anemia. Not by the norm, but by what physiology needs.

10. The pill: what it does, and what comes after

I do not judge. I inform. Because the educational conversation around prescribing the pill is often shockingly short in Germany.

The pill works essentially like this: synthetic estrogens and progestins (synthetic progesterone) are taken. The pituitary registers: hormones present. No LH surge. No ovulation. No natural cycle.

The monthly bleeding under the pill is no real period. It is a withdrawal bleed, because in the pill-free week the synthetic hormones stay away and the lining sheds. No ovulation. No progesterone. No allopregnanolone. No GABA boost.

What the pill can change in your body

First, it could deplete nutrients. Vitamin B6, B12, folate, magnesium, zinc, selenium. These nutrients are essential for neurotransmitter synthesis and hormone metabolism. What happens when, after ten years on the pill, you stop and selenium, zinc and B6 are depleted? The restart becomes harder.

Second, the pill strongly raises SHBG. This protein binds not only estrogen but also testosterone. Which means: less free testosterone. Less libido. Less energy. Less drive. And the curious thing: SHBG can remain elevated after stopping, sometimes for months.

Third, the pill could change the gut microbiome and thereby affect the estrobolome.

Post-pill: the restart no one explains

When you stop the pill, the body's own system has to start up again after months or years of suppression. That takes time. In some women it goes quickly. In many it takes three to six months until the cycle is stable.

What often happens during this time: an androgen rebound. The ovaries begin to produce again, sometimes overshooting. This can lead to acne, oilier skin, mood swings.

At the same time, the first cycles are often anovulatory. No ovulation, no progesterone. That means: a phase of potential estrogen dominance until the rhythm has normalized. This phase is transient. But it is real. And it deserves real support, not "just wait".

11. What I measure in practice and why I do not start with the lab

When a woman comes to me, the conversation does not begin with a lab sheet. It begins with a long history. With real listening.

I ask: when do the symptoms appear? In which cycle phase? How do you sleep, really? What does your morning look like, from the first thought to the first bite? What do you eat and in what order? Have you ever lived in an apartment with visible mold? Did you have amalgam fillings, and when and how were they removed? Are you on the pill or have you stopped, and when? Are there thyroid disorders in the family?

Only when I understand this do I see which lab brings new information. Not everything at once. But what really moves us forward.

12. Seven levers. Today. Not next Monday.

And now the decisive step: from understanding to action.

I know how it is. You read something, nod inwardly, think "I will try that out", and a month later nothing has happened. Because everything sounds somehow doable, but nothing is really anchored.

Therefore I ask you: choose right now while reading two levers. Only two. And start tomorrow morning.

13. Your self-check: who are you in this story?

Before you go to the doctor, before you order anything, before you change anything: ask yourself these questions.

Not for me. Not for the record. But so that you start to understand your own body instead of following it like a stranger.