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Dr. Tyna Moore · 2026-05-14 · Tyna Moore (host), Amie Hornaman

What Doctors Don't Tell You About Your Thyroid | Dr. Amie Hornaman

26 research-tied claims examined: 4 contradicted 7 overstated 4 context 9 supported 2 unverified

7

Overstated

0:29:06Amie Hornamanoverstatedlow

Impaired thyroid function reduces immune system function and diminishes the body's ability to surveillance and destroy cancer cells.

"So, we know that if your thyroid isn't functioning well, then your immune system isn't even functioning at a top level. So, why did we see, you know, so many people being taken out by COVID when, you know, it's just a virus. It's just a—man-made, but you know, that's a whole other discussion. But, you know what? If your thyroid isn't functioning well, even your ability to surveillance cancer cells, like your body's ability to seek out and destroy the cancer cells that we all have in our body" (said at 0:29:06)

While thyroid hormones do play a role in modulating cellular metabolism, leukocyte function, and adaptive immune responses (including T cell differentiation), the relationship between thyroid status and immune function is complex, bidirectional, and context-dependent rather than a simple on-off switch. Furthermore, asserting that impaired thyroid function impairs cancer immune surveillance across the board is an oversimplification not supported by clinical oncology data; in multiple malignancies, hypothyroidism is actually associated with slower tumor growth or improved responses to immune checkpoint inhibitor therapy, whereas thyroid hormones can sometimes stimulate tumor proliferation and angiogenesis.

0:15:00Tyna Moore (host)overstatedmoderate

Hypothyroidism is associated with and can present as frozen shoulder and tendon tears.

"I mean, you rip a tendon before you're menopausal, I should say, because if you rip a tendon when you're menopausal, I'm going to blame estrogen, too. But you rip a tendon, I'm like, "Thyroid." ... You have chronic thoracic pain, thyroid. You have migraines, thyroid." (said at 0:15:00)

Hypothyroidism has a well-established observational and genetic association with frozen shoulder (adhesive capsulitis). A meta-analysis of 10 case-control studies found that patients with adhesive capsulitis had significantly higher odds of hypothyroidism (OR 1.92) and subclinical hypothyroidism (OR 2.56). However, the claim that premenopausal tendon tears can be broadly attributed to thyroid dysfunction is overstated. While basic science models and case reports suggest thyroid hormone imbalance may alter tenocyte biology and tendon healing, systematic reviews and meta-analyses evaluating major tendon injuries (such as full-thickness rotator cuff tears) find that thyroid disease is not a significant independent risk factor compared to mechanical, anatomical, and age-related factors.

0:15:48Amie Hornamanoverstatedlow

Low thyroid function is a causative factor in migraines and frozen shoulder.

"then I go into those wild and wacky symptoms that you wouldn't necessarily pair up with thyroid like migraines and frozen shoulder that absolutely can be attributed to low thyroid function." (said at 0:15:48)

While observational studies show a significant statistical association and comorbidity between hypothyroidism and migraine (e.g., in a large multinational cohort of over 33 million patients), the relationship is largely correlational and bidirectional rather than a definitive direct cause. Furthermore, evidence linking hypothyroidism directly to frozen shoulder (adhesive capsulitis) is mixed and unproven; a 2025 systematic review and meta-analysis of metabolic and hormonal factors found no significant association between frozen shoulder and thyroid function (SMD 0.067, 95% CI -0.024 to 0.158). Claiming that migraines and frozen shoulder can 'absolutely be attributed to low thyroid function' overstates correlational and conflicting observational findings as established causal relationships.

0:32:13Amie Hornamanoverstatedlow

Functional psychiatry uses T3 to treat conditions like manic depression and schizophrenia due to T3 receptor sites in the brain.

"Functional psychiatry will use T3 even for extreme cases, like manic-depressive and schizophrenia, they will use T3 because of the T3 receptor sites on the brain." (said at 0:32:13)

Triiodothyronine (T3 or liothyronine) augmentation has been studied and used in psychiatry for treatment-resistant affective disorders, including bipolar depression (historically referred to as manic depression), due to the role of thyroid hormones and thyroid hormone receptors in central nervous system neurotransmission and mood regulation. However, systematic reviews note that evidence for T3 in bipolar disorder remains limited, mixed, and based largely on small or open-label studies. Furthermore, there is no established clinical evidence or guideline support for using T3 to treat schizophrenia.

0:33:40Amie Hornamanoverstatedlow

Epstein-Barr virus is a major precursor to Hashimoto's thyroiditis.

"EBV is a huge precursor to Hashimoto's." (said at 0:33:40)

While Epstein-Barr virus (EBV) has been investigated as a potential environmental trigger or cofactor in Hashimoto's thyroiditis and other autoimmune thyroid diseases, describing it as a "huge precursor" significantly overstates the scientific evidence. Observational studies report variable detection rates of EBV in thyroid tissue and blood of Hashimoto's patients, but findings are inconsistent, and controlled studies show no clear causal link or significant difference in viral presence compared to controls. Current consensus views EBV as one of several hypothetical environmental triggers in genetically predisposed individuals, rather than an established major precursor.

0:40:22Amie Hornamanoverstatedlow

Eating gluten triggers molecular mimicry and antibody attacks against the thyroid gland in individuals with Hashimoto's thyroiditis.

"like you said, molecular mimicry, whenever you eat gluten, that's kicking up a thyroid storm. It's kicking up your antibodies basically to attack your thyroid." (said at 0:40:22)

The claim that eating gluten directly triggers acute antibody attacks or a "thyroid storm" via molecular mimicry in patients with Hashimoto's thyroiditis is overstated. While molecular mimicry (such as cross-reactivity involving transglutaminase enzymes) is a hypothesized theoretical link between celiac disease and autoimmune thyroiditis, published clinical studies do not demonstrate that gluten ingestion triggers acute antithyroid antibody surges or thyroid destruction in Hashimoto's patients who do not have celiac disease. Reviews of the scientific literature conclude that evidence is insufficient to recommend a gluten-free diet to non-celiac patients with Hashimoto's thyroiditis. Furthermore, a "thyroid storm" is a specific, life-threatening medical emergency involving severe hyperthyroidism, not a reaction triggered by gluten in Hashimoto's thyroiditis.

0:54:40Tyna Moore (host)overstatedlow

Low thyroid function impairs keratinocyte turnover, leading to cystic acne, keratosis pilaris, rough skin, and ingrown toenails.

"if your thyroid is low, your keratinocytes aren't turning over. So, you end up with cystic acne. You end up with the bumps on the arm. You end up with rough—I I get rough outer thighs. Um, I just get rough skin everywhere. I get that, you know, I've seen dermatologists on Instagram talk about that fishy skin that people get on their shins. ... Ingrown toenails are a thyroid symptom because the keratinocytes around the nail bed won't shed." (said at 0:54:40)

Thyroid hormones are well-established regulators of skin homeostasis, epidermal differentiation, and keratinocyte proliferation. Low thyroid function (hypothyroidism) is known to cause cutaneous changes such as xerosis (dry, rough skin) and acquired ichthyosis (scaling or "fish-scale" appearance on the shins) due to reduced epidermal turnover, barrier alterations, and decreased sweating and sebum production. However, extending this mechanism to claim that hypothyroidism directly causes cystic acne or that ingrown toenails are a thyroid symptom driven by failure of periungual keratinocytes to shed is unsupported. Cystic acne is primarily driven by excess sebum production, follicular hyperkeratinization, microbial colonization, and inflammation, whereas hypothyroidism typically reduces sebaceous gland activity. Similarly, ingrown toenails (onychocryptosis) are primarily mechanical in etiology (such as improper trimming, ill-fitting footwear, or anatomic nail morphology) rather than recognized clinical manifestations of low thyroid turnover.

Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.