Can a Thyroid Problem Keep Me in Chronic Freeze? Reverse T3 and Shutdown, with Dr. Amie Hornaman (Part 1)

This is Part 1 of a two part conversation.

Can a thyroid problem keep you in chronic freeze? It can contribute, and the reason is that the same shutdown physiology that holds a nervous system in freeze also changes what the thyroid does. When the body decides survival is the priority, it stops converting thyroid hormone into the form your cells can use.

You have been doing the work. You understand your patterns. You can name what happened to you.

And you are still waking up unable to face the day, still forcing yourself upright, still watching your capacity for ordinary life stay smaller than it used to be.

Somewhere in that gap, many people have also been told their labs are fine. Mine were. In 2014 my TSH came back at around four and my physician told me that was within normal range. I was a physician myself. I was also not fine.

In this episode of the Biology of Trauma® podcast, I speak with Dr. Amie Hornaman, DCN, CFMP, known as the Thyroid Fixer, founder of The Better Thyroid and Hormone Institute and author of The Thyroid Fix. She was misdiagnosed six times in her twenties before anyone found the answer.

What may surprise you is that the marker she ranks above every other one is a marker almost nobody orders.

Freeze is not only a nervous system state. When the body believes it is fighting for survival, it converts thyroid hormone into an inactive form called reverse T3, which blocks the active hormone from entering the cell. Dr. Hornaman ranks reverse T3 as her most important marker and holds that stress and trauma can raise it directly. The result is a body running low and slow, which is the same physiology I call chronic functional freeze.

What does freeze actually look like in the body?

Everything running at reduced speed. Not the fight or flight version of a stress response, where there is at least energy and urgency, but the version underneath it, where the body has concluded it cannot win and shifts to conserving instead.

Dr. Hornaman describes what the body does when it believes it is in danger of dying. It takes energy from every other system and sends it to survival.

"You don't need to burn body fat. You don't need to think. You don't need to feel good. You don't need to grow your hair. You need to lie there and survive."

That is a description of a car accident. It is also a description of a life.

Chronic functional freeze: an immobilization state that persists long after the threat, where the body remains in conservation mode. Still functioning, still showing up, still taking care of everyone, and forcing itself out of bed each morning.

Can stress and trauma change thyroid function directly?

Dr. Hornaman's position is yes. She states that high stress states, and trauma on its own, can raise reverse T3.

This is the connection that makes the episode matter for anyone in trauma recovery. It means the shutdown is not only being maintained by an unresolved memory or an unregulated nervous system. There may be a biochemical loop running alongside it, one that keeps the body low and slow regardless of how much insight has been gained.

She calls the thyroid a canary in the coal mine. It responds to what is happening in your life.

What is reverse T3, and why does it matter for freeze?

Reverse T3 is an inactive version of the active thyroid hormone, and Dr. Hornaman uses it to read whether your body is converting T4 into a usable form at all.

Her analogy is the one people remember. Reverse T3 is the bouncer at the club with his arms crossed, telling T3 it is not getting in tonight.

Her point is that it rises when the body is protecting itself, and that it does not always come back down. Someone can be walking around, working, raising children, doing their healing work, with a body still chemically signalling that it is dying.

Reverse T3: a structurally similar but inactive form of T3. Dr. Hornaman uses it as a read on whether the body is converting thyroid hormone into a usable form, and treats it as her top-ranked marker, ahead of free T3.

Why do normal labs miss this?

Because conventional screening usually measures one thing, and it is not a thyroid hormone.

TSH is the signal your pituitary sends telling the thyroid to release. Dr. Hornaman's argument is that if you want to know about the thyroid, you look at what the thyroid produced and what reached the cell. She is equally impatient with the other side of the aisle, with the promise that a supplement protocol will resolve a gland that is not functioning.

She also wants free T3 in the upper quadrant of the range rather than merely inside it, and she treats a good free T3 result as unreliable without reverse T3 beside it.

TSH is a pituitary hormone, not a thyroid hormone. It measures the instruction sent to the thyroid, not what the thyroid produced or what reached your cells.

What happens to the thyroid after an accident or injury?

It takes a hit, and what matters is how long it has been.

In the weeks afterward, Dr. Hornaman treats it as a gland needing support: magnesium, selenium, iodine, and L-tyrosine, the amino acid that combines with iodine to build thyroid hormone in the first place.

Six months or a year later, with weight climbing, hair thinning and cognition still not returning, she considers that support alone may no longer be enough. What interests me is how often that timeline gets attributed to the emotional aftermath alone, when something measurable may also be running.

What changes in midlife?

Progesterone falls first, and by her account progesterone also assists the conversion of T4 into T3. Testosterone follows. Estrogen swings before it drops.

Dr. Hornaman calls the thyroid consequence thyroid pause, and holds that the hormonal turbulence of this transition can flip a dormant autoimmune process into an active one. Her framing is that the conversation about perimenopause has gone everywhere except the gland sitting above all the others.

Why can't I meditate my way out of this?

Because the mind is not what made the decision.

A body in this state is not holding a belief that can be argued with. It has made a protective calculation at a level well below thought, and it will keep making it until the conditions change. Telling someone in shutdown to change their mindset is addressed to the wrong system.

If you have done years of therapy and still cannot find the change, this is often the missing layer.

Do I need to know whether the trauma or the thyroid came first?

No, and this is the most freeing idea in Part 1.

At the point where you are living it, the two feed each other. Trauma physiology raises reverse T3. Low thyroid function lowers your capacity to process anything difficult, including trauma. Trying to establish which one started it is a question you cannot answer and do not need to.

You do not need to identify which came first. Both are true now, both are feeding each other, and both can be supported at the same time.

Key Takeaways

• Freeze is a whole-body conservation state, not only a nervous system pattern.

• When the body believes survival is at stake, it converts thyroid hormone into an inactive form.

• Dr. Hornaman holds that stress and trauma alone can raise reverse T3.

• Reverse T3 can block active thyroid hormone from entering the cell, so ordinary labs can look fine.

• The resulting low and slow physiology matches what I call chronic functional freeze.

• TSH is a pituitary hormone, not a thyroid hormone, and a normal TSH does not settle the question.

• Dr. Hornaman ranks reverse T3 first among markers and free T3 second.

• A free T3 inside the range is not the same as a free T3 in the upper quadrant.

• Insight and mindset work do not reach a system operating below thought.

• After an injury, the thyroid may need support acutely and reassessment six to twelve months later.

• You do not need to establish whether trauma or biology came first in order to address both.

Notable Quotes

"The thyroid is kind of a canary in the coal mine. It's going to respond to things happening in your life." — Dr. Amie Hornaman

"High stress states or trauma in and of itself can increase your reverse T3." — Dr. Amie Hornaman

"So if you're ever in a car accident, you're injured, you're in the ICU, the er reverse T3 is going to go up because at that point in time, our bodies are so smart that it knows that you're fighting for your life." — Dr. Amie Hornaman

"You don't need to burn body fat. You don't need to think. You don't need to feel good. You don't need to grow your hair. You need to lie there and survive." — Dr. Amie Hornaman

"Reverse T3, I like to call it like the bouncer at the club. You know, that big like burly bouncer guy that stands outside the club door with his arms crossed. He's telling T3 like, dude, you're not getting in tonight." — Dr. Amie Hornaman

"If I had to rank the markers in importance, reverse T3 would be number one, free T3 would be number two." — Dr. Amie Hornaman

"If it's in your blood and it's not getting in the cell, it's not doing its job. It does us no good whatsoever." — Dr. Amie Hornaman

"They're going to run one test called TSH thyroid stimulating hormone. Now that's a brain hormone. It's not a thyroid hormone." — Dr. Amie Hornaman

"There's not a single cell in your body that has a receptor site on it for T4." — Dr. Amie Hornaman

"There are more thyroid receptors on the brain than any other part of your body." — Dr. Amie Hornaman

"It is the body's trauma response where it thinks it might die and all energy is going to just surviving, not in a I'm going to fight, I'm going to flight type of energy. It's a I'm hibernating. I'm shutting down." — Dr. Aimie Apigian

"You don't need to know what came first, the chicken or the egg. They're feeding each other. It doesn't matter at this point. You just need to recognize it and be aware." — Dr. Amie Hornaman

Episode Takeaway

I want to talk about what it costs to be told you are fine.

Most of the people I work with have been told this more than once. Sometimes by a physician holding a lab result. Sometimes by people who love them and cannot understand why the healing work has not worked yet. Sometimes by themselves, at three in the morning, deciding that the exhaustion must be a character problem they should be handling better.

That accumulation does something specific. It does not only leave the problem unaddressed. It teaches you to distrust your own reporting. And once that lesson lands, the freeze gets a great deal harder to leave, because leaving it requires you to take your own experience seriously enough to act on.

What this conversation adds is a mechanism, and mechanisms are steadying. Not because a lab marker fixes anything by itself, but because it moves the conversation off your character and onto your physiology, which is where it belonged the whole time.

The state Dr. Amie describes biochemically and the state I describe as shutdown are the same state seen from two windows. A body that has concluded survival is the priority stops spending energy on anything that is not immediately necessary. Hair, digestion, clear thinking, the capacity to be interested in your own life. These are not luxuries the body is withholding out of spite. They are line items it has cut.

And here is the part I most want you to hear. That decision was not made badly. It was made by a system doing precisely what it was built to do, in a situation that went on far longer than the design ever anticipated. There is nothing wrong with you. There is something unfinished in you, which is a different thing entirely, and unfinished things can be completed.

This is the pattern I write about in Chapter 9 of The Biology of Trauma, where the body's protective decisions outlast the situation that produced them.

Which brings me to where Dr. Amie and I ended. You do not have to determine whether the trauma came first or the biology did. That question feels urgent and it is a trap, because it is unanswerable and it postpones everything useful. Both are true now. Both are feeding each other. Both can be supported at the same time, and neither has to wait for the other to be solved.

If the low and slow pattern is familiar, start with recognition rather than protocol. The 2-minute assessment will show you which of the five patterns of protection are running in you.

The Foundational Journey is where recognition becomes something your body has already done once. It is the 5 week entry point, and it builds the capacity the longer work asks for.

You are not lazy and you are not resistant. You are conserving. That is a very different problem, and it has a very different answer.

Your pace is the right pace.

FAQ

Can a thyroid problem keep me stuck in freeze?

Dr. Hornaman's position is that it can contribute. When the body believes it is in survival, it produces reverse T3, an inactive form that blocks active thyroid hormone at the cell. The result is the low and slow physiology of chronic functional freeze.

Can trauma affect thyroid function?

She states that high stress states and trauma on their own can raise reverse T3. Neither of us claims a one-way causal chain. The relationship runs both directions and feeds itself.

Why hasn't my healing work moved the freeze?

Because insight addresses a level above where the decision was made. If a biochemical loop is running alongside the nervous system pattern, working only on the psychological layer leaves half of it in place.

Why do my labs come back normal when I feel this bad?

Conventional screening usually measures TSH, which is a pituitary hormone rather than a thyroid hormone. Dr. Hornaman looks at free T4, free T3 and reverse T3 before drawing a conclusion.

What is reverse T3?

An inactive form of the active thyroid hormone. Dr. Hornaman ranks it as her most important marker and describes it as capable of blocking T3 from entering the cell, which is why a good free T3 result can coexist with real symptoms.

Why does low thyroid function affect memory and mood so strongly?

Because there are more thyroid receptors in the brain than anywhere else in the body, so cognition, motivation and mood are affected before anything visible is.

What is thyroid pause?

It is Dr. Hornaman's term for thyroid function declining alongside the sex hormones during perimenopause, menopause and andropause. It is a practitioner term rather than a formal diagnosis.

Do I need to figure out whether my trauma or my thyroid came first?

No. Both feed each other, and both can be addressed at the same time.

In this episode

• 02:39 — What is the nonsense being said about thyroid symptoms?

• 04:31 — Why is TSH the wrong test to rely on?

• 06:26 — What happened when my own TSH came back at four?

• 07:33 — What is the difference between T4 and T3?

• 09:40 — Why does free T3 need to be in the upper quadrant?

• 10:43 — How does T3 affect stress resilience?

• 12:42 — Why does Dr. Hornaman rank reverse T3 above free T3?

• 14:58 — What does reverse T3 do in the body, and why?

• 17:40 — How does the hibernation state connect to the trauma response?

• 19:15 — What happens to the thyroid after a car accident?

• 22:41 — When do nutrients stop being enough?

• 26:41 — What changes in perimenopause and andropause?

• 31:13 — What does chronic functional freeze look like from the inside?

• 34:03 — Why can't you meditate your way out of it?

• 36:17 — Dr. Aimie's closing reflection

  
  

Resources and Guides

• Take the free 2-Minute Assessment for Stored Trauma. Find your primary pattern of responding when life becomes too much, then see how the other four show up. You cannot change a pattern you cannot see.

• Get The Biology of Trauma. The biology underneath these patterns, and what the body needs to come back toward safety.

• The Thyroid Fix by Dr. Amie Hornaman The optimal ranges she describes in this episode are in it.

• Stress vs. Trauma Guide — a free guide to tell a stress response from a trauma response, and see the sequence your nervous system needs next.

  
  

Related Podcast Episodes

• EP 153: The Biology of Burnout — Why Pushing Through Stops Working. If the low and slow state landed, this is what it looks like from the nervous system side rather than the biochemical one.

• EP 129: Why You're Still in Survival Mode Even After Years of Therapy and Healing Work. For anyone who has done the work, understands what happened, and still cannot find the change.

• EP 133: Autoimmunity and Childhood Trauma: How Your Immune System Reflects Your Past. For anyone whose thyroid question turned out to be an autoimmune question.

About the guest

Dr. Amie Hornaman, DCN, CFMP is known worldwide as the Thyroid Fixer. She is founder and CEO of The Better Thyroid and Hormone Institute, host of The Thyroid Fixer podcast, and author of The Thyroid Fix. She holds a doctorate in clinical nutrition and functional medicine from Maryland University of Integrative Health, a master's in clinical nutrition from West Virginia University, and a bachelor's in psychology from Penn State. Her own experience of being misdiagnosed six times shapes the testing-first approach she teaches.

Your host: Dr. Aimie Apigian is a double board-certified physician in Preventive and Addiction Medicine, author of the national bestselling book The Biology of Trauma (foreword by Gabor Maté) and the founder of the Biology of Trauma® framework that reshapes how we understand the way the body experiences and holds trauma. She holds master's degrees in biochemistry and public health. Foster-adopting a child during medical school set her on this path, and her search for answers deepened as she developed her own chronic health issues. Through Trauma Healing Accelerated®, her practitioner training, podcast, YouTube channel, and international speaking, Dr. Aimie bridges functional medicine, attachment science, and trauma therapy, with a focus on facilitating accelerated repair of trauma's impact on the mind, body, and biology.

Research

1. Van den Berghe G. Non-Thyroidal Illness in the ICU: A Syndrome with Different Faces. Thyroid. 2014;24(10):1456–1465. PMID: 25162536. — On what happens to thyroid hormone conversion when the body is under severe physiological stress, and why the acute and prolonged phases behave differently.

2. Fliers E, Bianco AC, Langouche L, Boelen A. Thyroid function in critically ill patients. The Lancet Diabetes & Endocrinology. 2015;3(10):816–825. PMID: 26071885. — On the deiodinase shift that lowers T3 and raises reverse T3 during illness, which is the mechanism underneath the hibernation state described in this episode.

Disclaimer

By listening to this podcast, you agree not to use this podcast as medical, psychological, or mental health advice to treat any medical or psychological condition in yourself or others. This podcast is for informational and educational purposes only and does not constitute professional advice, diagnosis, or treatment. Always consult your own physician, therapist, psychiatrist, or other qualified health provider regarding any physical or mental health issues you may be experiencing.

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