# Hashimoto's Thyroiditis

Category: Conditions

Also known as: Hashimoto's, autoimmune thyroiditis

Hashimoto's thyroiditis is not a primary autoimmune attack but rather the final stage of a simple colloid goiter, driven by chronic overstimulation and metabolic blockage. Peat argued that the condition, originally defined by lymphocytic infiltration of the gland, is now…

12 passages · 1 author · 1993–2025 · Most-cited: [Ray Peat](https://bioenergeticoracle.com/md/voices/ray-peat/index.md)

Canonical page: https://bioenergeticoracle.com/concepts/hashimoto-s-thyroiditis

## Synthesis

**Hashimoto's thyroiditis** is not a primary autoimmune attack but rather the final stage of a *simple colloid goiter*, driven by chronic overstimulation and metabolic blockage. [Source 2, 3] Peat argued that the condition, originally defined by lymphocytic infiltration of the gland, is now diagnosed by "pure guesswork" based on blood antibodies without biopsy, and that the presence of **antithyroid antibodies** does not prove the immune system is causally destroying the gland. [Source 1, 2, 7] Instead, the antibodies are part of a *cleanup process*, mobilized to remove debris from tissue injured by prolonged stress. [Source 4, 6, 10] The root injury stems from factors that block thyroid hormone production and release, forcing the pituitary to secrete excess **thyroid stimulating hormone (TSH)**, which itself acts as an inflammatory agent. [Source 2, 5, 10]

The pathogenic sequence begins when hormone release from the gland is inhibited. Estrogen activates the formation of the viscous protein **thyroglobulin** (colloid) but blocks its proteolytic digestion into active hormones, causing the gland to enlarge even as systemic hypothyroidism develops. [Source 3, 8] Progesterone, conversely, activates the proteolytic enzymes that release the hormones. [Source 3] Other blocking agents include excess iodine, which can suppress hormone formation and induce classical hypothyroid signs, and **polyunsaturated fats (PUFA)**. [Source 2, 8, 10] The resulting deficiency in thyroid hormone triggers a compensatory surge in TSH, and the mechanical and chemical stress of this chronic overstimulation creates an inflammation-like state within the gland. [Source 2, 5, 12] Peat noted that TSH itself causes many symptoms blamed on hypothyroidism by acting on bone marrow, the liver, and other tissues to increase inflammatory cytokines. [Source 5]

The antibodies measured in diagnosis—such as *antithyroglobulin* and *antithyroperoxidase*—are not specific to the thyroid and appear whenever connective tissue is disrupted. [Source 3, 7] Peat cited evidence that these antibodies are found more frequently in rheumatoid arthritis and Sjogren's syndrome than in Hashimoto's disease, and that they interact with joint cartilage, making the condition fundamentally a **connective tissue inflammatory disease** accompanying hypothyroidism. [Source 6, 7] The immune system treats the stressed, debris-filled tissue as if it were infected, and the antibodies serve to help phagocytes clear the accumulated junk. [Source 4, 6, 9] This explains why the condition is five to ten times more frequent in women: estrogen not only blocks thyroid secretion but also causes rapid thymic atrophy, degrading the normal regulation of immune functions. [Source 2, 7]

Treatment, in Peat's framework, does not require immunosuppression but rather the removal of the underlying thyroid inhibition. He observed that simply supplementing thyroid hormone—even synthetic thyroxine (T4)—for six months to a year usually suppresses TSH, resolves the inflammatory drive, and causes the antibodies to decrease or disappear. [Source 2, 4, 5, 11] However, he cautioned that women with high estrogen often cannot convert T4 to the active **T3** hormone in the liver, making T3 supplementation necessary in some cases. [Source 5, 9] Because the antibodies reflect a repair process rather than a self-destructive one, Peat considered thyroid, along with **progesterone**, **pregnenolone**, and **DHEA**, as the effective cure for so-called autoimmune thyroiditis, restoring the metabolic balance that halts the initial tissue injury. [Source 8]

## People also ask

### What does Ray Peat believe actually causes Hashimoto's thyroiditis?

Peat argued it is the final stage of a simple colloid goiter, driven by chronic TSH overstimulation and metabolic blockage from factors like estrogen, excess iodine, or PUFA, rather than a primary autoimmune attack.

### Why are antithyroid antibodies present if the immune system isn't attacking the gland?

Peat described the antibodies as part of a cleanup process, mobilized to remove debris from tissue injured by prolonged stress, treating the stressed gland as if it were infected.

### How did Peat propose treating Hashimoto's without immunosuppression?

He observed that supplementing thyroid hormone to suppress TSH resolves the inflammatory drive, often causing antibodies to decrease or disappear, sometimes with added progesterone or T3 if conversion is blocked.

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## Cited passages

Passage numbers match the `[Source N]` markers in the synthesis above.

### Source 1 — Hashimotos Antibodies Temperature and Pulse KMUD 2013

Ray Peat · Interview · 2013

> **Herb Doctor:** This month’s subject is Hashimoto, thyroiditis. Dr Peat, could you give us a resume of your academic professional background, for those who have never heard of you ?
>
> **Ray Peat:** I’ve studied biology at the University of Oregon, graduate school, 1968 to 1972. Did my dissertation on reproductive aging and oxidative processes, concentrating on the effects of estrogen and progesterone, largely. And came to explain why an excess of estrogen resembles the physiology of aging, stress, or x-ray poisoning. And that was sort of a follow up of my interest from the 1950’s on the effects of low-level radiation on public health. And, that’s been one of my continuing interests.
>
> **Herb Doctor:** Many people have recently contacted us about Hashimoto’s thyroiditis, and as your specialty is hormones, reproduction and thyroid, you have spent many years researching this subject. In your mind, what constitutes it, and what are it’s characteristic labs findings, his symptoms, and treatment ?
>
> **Ray Peat:** A hundred years ago, Hashimoto described it as an enlargement of the thyroid gland, caused by infiltration of white blood cells. And, some people actually stick a needle into the gland, and diagnose on the basis of how he described it that long ago. But the general principle is that it’s an enlarged gland that doesn’t produce enough hormones. So, you can make a guess as to it’s cause by looking at the blood: if you see that there seems to be a deficiency of the hormones in the blood, and maybe some evidence of inflammation, such as proteins and antibodies to the proteins from the thyroid gland, then they don’t bother doing the needle biopsy.

### Source 2 — Thyroiditis: Some confusions and causes of autoimmune diseases

Ray Peat · Article · 2003

> When other organs are damaged, the removal of debris can be delayed for days, as phagocytic cells gradually enter the tissues from the blood stream.
>
> Hypothyroidism is an important cause of thymic atrophy, and a thyroid supplement can stimulate regeneration of the thymus. This correction of the thymic portion of the "immune system" by the thyroid hormone is probably involved in the observation that the "antithyroid" autoantibodies decrease under the influence of supplemental thyroid hormone, but the supplement also affects the thyroid gland, by decreasing the thyroid stimulating hormone, TSH. Excess production of TSH causes an inflammation-like stress, that contributes to the production of the colloid goiter and eventually to disordered structural changes in the thyroid gland. A more efficient production and use of thyroglobulin will decrease the tendency of the overstimulated gland to produce a defective globulin that is antigenic. So, rather than ignoring the frequency of the simple colloid goiter and calling everything "Hashimoto's autoimmune thyroiditis," if we look at the mechanisms involved in the production of autoantibodies, we will tend to see "thyroiditis" as, usually, the last stage in the development of a simple colloid goiter. The autoantibodies, in a healthy person, are probably part of a corrective repair process, rather than a simply pathogenic factor.
>
> There is an almost obligatory medical genuflection toward "genetic causation" of disease, and especially of thyroid disease, autoimmune disease, and other chronic or degenerative diseases. The fact that thyroid disease and autoimmune diseases are from five to ten times more frequent in women than in men somehow hasn't increased medical interest in the pathogenic role of estrogen, and it doesn't prevent platoons of medical researchers from making claims to have discovered "which chromosome carries the disease." This medical bias means that even the physicians who recognize that hypothyroidism is a condition that should be corrected are not likely to believe that it is important to modify the treatment according to changes in the patient's condition. Many doctors assume that a person never recovers from thyroiditis, but the evidence is clear that simply giving supplementary thyroid usually gradually corrects the problem. If other protective measures are taken, recovery will be quicker and more complete.
>
> Injury to the thyroid apparently precedes the development of "autoimmune" thyroiditis.

### Source 3 — Thyroiditis: Some confusions and causes of autoimmune diseases

Ray Peat · Article · 2003

> # Thyroiditis: Some confusions and causes of "autoimmune diseases"
>
> Girls' thyroid glands usually enlarge during puberty, and in pregnancy it's entirely normal for the gland to enlarge and to become more active. Eighty years ago, when iodine deficiency was more common in the US and Europe, the idea of a "colloid goiter" was common. In certain regions, many people had enlarged thyroids that contained a large amount of colloid—colloid is the viscous protein (thyroglobulin) solution formed in tiny compartments in the thyroid gland, which can be broken down by "digestive" (proteolytic) enzymes of the cells that have secreted it, forming the thyroid hormones, and allowing them to be released into the blood stream. The hormones are formed as the accumulated protein is broken down; the hormone itself isn't stored in the gland.
>
> The reason for the enlargement of the gland during puberty and in pregnancy, and during some kinds of stress, is that the colloid is formed faster than it is digested by the thyroid gland and secreted into the blood. If something, such as an excess of estrogen, is blocking the production of the thyroid hormone, the gland is likely to enlarge, because the pituitary secretes more thyroid stimulating hormone (TSH) when there is a deficiency of thyroid hormone. In vitro experiments show that estrogen activates the formation of the colloid, but inhibits its breakdown into the hormones. Progesterone, on the other hand, activates the process of proteolytic digestion and so increases the release of hormones from the gland, decreasing the accumulation of the colloid. Therefore, when progesterone is deficient or estrogen is present in excess, the colloid tends to accumulate (even to the point of causing a visible enlargement of the gland, a "colloid goiter"), at the same time that the person may be hypothyroid, because the hormone isn't being released from the stored colloid into the blood stream.
>
> But, largely because no one wants to suggest that estrogen can be pathogenic, an enlarged thyroid gland is now likely to be diagnosed as "Hashimoto's thyroiditis" (or Hashimoto's struma, or goiter, or disease). Hashimoto's disease is clearly defined as the infiltration of the gland with lymphocytes, "causing destruction" of the gland's active tissue and leading to hypothyroidism.

### Source 4 — One Radio Network: Patrick Timpone: Dr. Peat Answers Questions Regarding Health, Diet and Nutrition Part 2

Ray Peat · Interview · Jan 1, 2014 · http://www.l-i-g-h-t.com/files/one-radio-network-patrick-timpone-dr-peat-answers-questions-regarding-health-diet-and-nutrition-part-2.mp4

> ## Hashimoto's and Autoimmune Issues
>
> **Patrick Timpone:** Can you talk a bit about Hashimoto's? Is that overactive or autoimmune?
>
> **Ray Peat:** It's underactive. Most of the so-called autoimmune things—the antibodies—really are part of a recovery process. Anytime you injure a tissue, your immune system will try to eat up the junk. It treats the tissue as if it had been infected. That's why they started calling it thyroiditis.
>
> **Patrick Timpone:** It's not the immune system attacking your thyroid; it's doing what it's supposed to do.
>
> **Ray Peat:** Yeah. If you block the thyroid function for some reason, then you have to stimulate it more strongly with TSH (Thyroid Stimulating Hormone). Just that stimulation creates a type of inflammation. If that goes on too long—for example, blocking it with too much iodine, too much PUFA, or estrogen—then your immune system will come in and clean up some of the junk.

### Source 5 — Hashimotos Antibodies Temperature and Pulse KMUD 2013

Ray Peat · Interview · 2013

> **Ray Peat:** Yeah. It’s well established, lately, the last several years, that TSH itself causes many of the symptoms blamed on hypothyroidism; it acts on the bone marrow, and many other tissues ( the liver, producing, increasing the inflammatory cytokines chemicals). So, in itself it’s the basic problem with hypothyroidism, I think.
>
> **Herb Doctor:** You’ve always said that TSH in its own right is a chaperone for other inflammatory molecules. In a normal healthy person, it’s a good idea to try to get the TSH as close to zero as possible. Does TSH have any benefits, apart from stimulating the production, or release, of thyroid hormone ?
>
> **Ray Peat:** My newsletter on osteoporosis a couple of years ago, went over the arguments they’re using to say that it prevents osteoporosis. I think that the references that I give in there show that basically it’s just increasing the load of inflammation.
>
> **Herb Doctor:** Thyroxin is the main compound given to treat Hashimoto.
>
> **Ray Peat:** Yeah. If they give enough…there has been some studies in which the antibodies tend to disappear after about six months of keeping the TSH under control.

### Source 6 — Ray Peat Interview on Iron Toxicity, Estrogen, PUFA, Thyroid, and Stress Hormones

Ray Peat · Interview · Sep 15, 2025 · https://www.youtube.com/watch?v=9UmFIaFm2Mc

> **Ray Peat:** Those antibodies interact with cartilage of the joints just about as well as with the cartilage, so it's It's really a connective tissue inflammatory disease which goes with hypothyroidism. The cartilage is one of the first places that you see hypothyroidism in children. It accounts for why hypothyroid kids tend to be knock-kneed and why girls aren't good pitchers. often because the cartilage in the knees and the elbows is basically swollen.
>
> **Caller:** So basically a lot of people walk around being misdiagnosed for this, right?
>
> **Ray Peat:** Yeah.
>
> **Caller:** Yeah. Okay, great. All right. Thank you so much for your time, Dr. B. Josh, I'll give you a call later. Thank you.
>
> **Josh Rubin:** Thanks. Have a good one. All right, brother. Good questions. I was reading one of your old articles on Hashimoto's and thyroiditis, and I found it pretty interesting because you talk about how estrogen is affecting, correct me if I'm wrong, the colloid and actually stimulates it but inhibits the exact proteolytic cells to break it down. And that's why a lot of people are getting diagnosed with Hashimoto's because it's not so much the thyroid itself, it's the altered production of the antibodies because of estrogen.

### Source 7 — Thyroiditis: Some confusions and causes of autoimmune diseases

Ray Peat · Article · 2003

> Hashimoto's disease is clearly defined as the infiltration of the gland with lymphocytes, "causing destruction" of the gland's active tissue and leading to hypothyroidism. The only way to know that the gland is being invaded by large numbers of lymphocytes is by biopsy, but the condition is normally diagnosed by pure guesswork, without any biopsy. Sometimes "antithyroid antibodies" found in the blood are used to diagnose Hashimoto's disease, but the presence of those antibodies in the blood doesn't mean that they originated in the thyroid gland, and even though they have very specific names (e.g., "antithyroglobulin," "antithyroperoxidase") related to the thyroid gland, they aren't even specific for the thyroid gland. It has been suggested that similarities in molecular structure between thyroglobulin and connective tissue proteins could account for the finding of "antithyroid antibodies" more frequently in rheumatoid arthritis and Sjogren's syndrome than in Hashimoto's disease and Graves' disease (Ruggeri, et al, 2002).
>
> In the last 60 years, most of estrogen's toxic effects have been hushed up by the drug industry, and estrogen's central antirespiratory and antithyroid actions are unknown to most contemporary endocrinologists. But endocrinologists often do know that estrogen causes the thymus gland to atrophy, and that the thymus gland is intimately involved in maintaining normal immune functions. The degenerating thymus gland undergoes invasion by lymphocytes and the replacement of active tissue by fibrous tissue, under the influence of estrogen or stress. The process of cellular invasion in the thyroid gland probably develops more slowly than that in the thymus, because estrogen's effect on the thymus is very rapid. The cells that make up the thymus are extremely varied, but a large portion of them are able to phagocytize other cells. This self-phagocytosis probably contributes to the gland's ability to shrink with such great rapidity. When other organs are damaged, the removal of debris can be delayed for days, as phagocytic cells gradually enter the tissues from the blood stream.
>
> Hypothyroidism is an important cause of thymic atrophy, and a thyroid supplement can stimulate regeneration of the thymus.

### Source 8 — Thyroid: Misconceptions

Ray Peat · Newsletter · Nov 1993

> Animal experiments show that coconut oil added to a normal diet can lower serum cholesterol levels. There is a very reliable inverse relationship between the level of serum cholesterol and thyroid hormone action. A major effect of thyroid is to control the conversion of cholesterol into steroid hormones and bile acids.
>
> Thyroid promotes the formation of progesterone, which in turn promotes the secretion of thyroid hormones. Estrogen blocks their release from the thyroid gland, causing the gland to enlarge.
>
> Iodine deficiency used to cause goiters in the United States, but now it is almost impossible to have an iodine deficiency in this country. Iodine supplements can suppress the formation of thyroid hormone, producing classical signs of hypothyroidism.
>
> Hashimoto's thyroiditis is often diagnosed, without appropriate evidence. Even when correctly diagnosed, the knowledge isn't relevant to treatment. Thyroid cells contain estrogen receptors, and estrogen inhibits thyroid secretion, and excess estrogen is involved in most autoimmune disease. Supplemental thyroid so easily normalizes estrogen and the immune system that it, with progesterone and pregnenolone and DHEA, should be considered as the cure for autoimmune diseases, including thyroiditis—at least until someone finds an autoimmune disease that doesn't respond to a balancing of these hormones.
>
> Breast discomfort and even the secretion of milk not associated with pregnancy or parturition, produced by excess prolactin, can often be relieved by thyroid, especially when taken with vitamins A and E. The incidence of breast cancer is high in hypothyroid regions. Excess prolactin and excess estrogen are associated with each other, with breast cancer, and with hypothyroidism.
>
> Most physicians know how to test the Achilles tendon reflex, but believe it is a poor indicator of thyroid function. Often, this is because they have observed the reflex contraction itself, rather than the relaxation rate, which gives a clear indication of the rate at which energy is regenerated in the muscle. The T wave or repolarization wave in the electrocardiogram gives a similar indication of lagging energy production in hypothyroidism. Magnesium retention by cells is dependent on thyroid hormone, and is essential for cell relaxation.
>
> The rate of energy restoration is relevant to the tired brain, too. Insomnia is the most commonly troublesome symptom of menopause, and it usually responds immediately to a small bedtime dose of T3, just as T3 rapidly restores the normal quick relaxation rate to the calf muscles and heart muscle.

### Source 9 — Your Own Health And Fitness: Thyroid/Progesterone And Diet

Ray Peat · Interview · Nov 12, 1996 · http://www.l-i-g-h-t.com/files/your-own-health-and-fitness-thyroid-progesterone-and-diet -november-12-1996-57-mins.mp4

> **Layna Berman:** Broda Barnes may be in the library. Okay, let’s move to another caller. Caller you’re on the air with KPFA.
>
> **Caller:** Yes, I was diagnosed with Hashimoto’s disease.
>
> **Layna Berman:** Along with everybody else…
>
> **Caller:** Six months ago, where it was just astronomically high level of thyroid antibodies. I have no symptoms which can clearly be traced to it and I’m now reached a dose of Synthroid which bounces up my blood test but there is no change in the way that I feel.
>
> **Ray Peat:** There is a lot of history involved here but in the practical point that I’ve seen is that, for example any tissue which is injured, like they have experimentally twisted a piece of cartilage and found that just that small amount of disruption causes it to raise antibodies from its own body and so any tissue which is under stress is going to have antibodies as part of a cleanup process. So don't worry about the diagnosis or the antibodies because everyone who corrects their thyroid function that I've seen has corrected their antibody level after about a year of good functioning but the real problem is that in the 1940s, it was known that almost half of Americans were hypothyroid and got over their symptoms, whether it was diabetes or heart disease or infections, when they were given adequate thyroid. But a drug company came out with the test for protein-bound iodine in the blood and they found that 95% of the population had enough of that and so were not hypothyroid and that indoctrinated the whole country to believe that only 5% of the population is really hypothyroid. But in the 60s, it turned out that that test was complete nonsense that didn't measure anything of significance but what stuck was the doctrine that 95% of the people are not hypothyroid and the Synthroid-type thyroxin was tested in the 1940s on young male medical students who were healthy and they said it works just like thyroid but the fact is that it was not tested on women and women, because of the high estrogen that is exaggerated by low thyroid, women who are low thyroid have almost a complete inability to respond to thyroxin because it has to be activated by the liver. And over and over I see women who get more and more hypothyroid as they take more and more thyroxin, and sometimes this happens in men, sometimes men can respond because their livers are not as poisoned by estrogen.

### Source 10 — One Radio Network: Health & Diet

Ray Peat · Interview · Dec 4, 2013 · http://l-i-g-h-t.com/files/one-radio-network-patrick-timpone-dr-peat-answers-questions-regarding-health-diet-and-nutrition-part-1.mp4

> **Caller:** I love orange juice, but I stay away, I have bought into that idea that too much sugar idea. But it boosts Thyroid function?
>
> **Ray Peat:** Yes
>
> **Caller:** Can you talk about Hashimotos? Is that overactive or autoimmune Thyroid?
>
> **Ray Peat:** It’s Hypothryoid, underactive Thyroid.
>
> **Caller:** But it’s autoimmune?
>
> **Ray Peat:** So-called, most of the autoimmune antibodies are part of the recovery process. Any time you injure a tissue, the immune system will try to eat up the junk, it will treat the tissue like it’s been infected. So that’s why they started calling it Thyroiditis.
>
> **Caller:** So it’s not the immune system attacking your Thyroid, it’s doing what it’s supposed to do?
>
> **Ray Peat:** Yes, if you block the Thyroid for some reason, then you need to stimulate it with some type of Thyroid stimulating hormone, and just that stimulation creates a type if inflammation, and if that goes on for too long, eg blocking it with too much iodine, too much PUFA, too much estrogen, then you immune system will come in and clean up some of the junk.
>
> **Caller:** You’re saying you can definitely OD on Iodone?

### Source 11 — Herb Doctors: Thyroid, Polyunsaturated Fats And Oilsnew

Ray Peat · Interview · Apr 1, 2009 · http://l-i-g-h-t.com/files/herb-doctors-thyroid-polyunsaturated-fats-and-oils-new-56-mins.mp4

> **Andrew Murray:** Yeah, we do. Go ahead, caller.
>
> **Caller:** Hi. This is Kevin.
>
> **Andrew Murray:** Hey, Kevin.
>
> **Caller:** Hi, Andrew and Sarah. Hi. So I had a question about Hashimoto's disease. I was diagnosed with that. And understand that it interferes with the absorption of thyroid. And I am wondering if Dr. Peat can speak about Hashimoto’s and what if anything can be done to alleviate it, cure it?
>
> **Ray Peat:** The disease was originally defined as infiltration of white blood cells into the inflamed thyroid gland and since they did not necessarily like to cut out a piece of gland to confirm that what was wrong. They started looking at antibodies in your blood and assuming that you would have the infiltration and inflammation of the gland if you find the antibodies circulating in the blood, but in fact the antithyroid antibodies overlap with many other problems, including arthritis. And so, the antibodies aren’t strictly clearly diagnostic, but they do indicate that something is inflamed. And since the thyroid is the basic anti-inflammatory hormone and organ, it’s very often the thyroid that is the main problem when you have these antibodies. And there have been several studies in which simply supplementing even with thyroxine for six months or a year, the antibodies will decrease and the whole problem is solved.

### Source 12 — Ray Peat Email Advice Depository — Post 85

Ray Peat · Email · Jun 29, 2013

> [Hashimoto Diagnosis]
>
> **Question:** Do high level of Thyroglobulin Antibodies and Thyroid Peroxidase (TPO) Antibodies show autoimmune thyroditis?
>
> **Ray Peat:** When TSH is too high for a long time, it causes inflammation in the gland, and the antibodies are in reaction to that

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