Thyroid Disease, Eczema & Psoriasis: Understanding the Connection
The thyroid gland sits at a junction of several biological systems relevant to eczema and psoriasis — metabolism, immune regulation, skin cell turnover, and barrier function are all influenced by thyroid hormone levels. Understanding why this connection exists — and what it does and doesn't mean for managing your skin — is more useful than either dismissing it or treating thyroid dysfunction as the primary explanation for skin flares.
Why the thyroid affects your skin
The thyroid gland controls hormones that regulate:
metabolism
temperature
skin renewal
oil production
immune function
When thyroid hormones become imbalanced, the skin is often affected.
Common skin-related symptoms of thyroid dysfunction include:
dryness
itching
sensitivity
scaling
slower skin repair
Can thyroid problems affect eczema or psoriasis?
Yes — thyroid disorders may be linked to both eczema and psoriasis, particularly through the immune system and inflammation.
In short:
Thyroid conditions can affect skin health
Autoimmune thyroid disease is linked to psoriasis
Hormonal imbalance may worsen dryness and inflammation
Thyroid issues are not the sole cause of eczema or psoriasis
How thyroid hormones influence skin
Thyroid hormones — primarily thyroxine (T4) and triiodothyronine (T3) — regulate the metabolic rate of virtually every cell in the body. For skin specifically, they influence several processes directly relevant to eczema and psoriasis.
Skin cell turnover is regulated by thyroid hormones. In hypothyroidism, skin cell renewal slows; in hyperthyroidism, it accelerates. Both affect how the skin barrier forms and functions. Sebum and moisture regulation are also thyroid-dependent — hypothyroidism reduces both oil and sweat production, resulting in the characteristic dry, rough skin of low thyroid function that overlaps significantly with eczema's dryness. Immune function is bidirectionally connected to the thyroid — thyroid hormones modulate T-cell function and cytokine production, and hypothyroidism is associated with a shift toward a more inflammatory immune profile in some people. In significant hypothyroidism, the skin can also develop myxoedema — a non-pitting swelling caused by glycosaminoglycan accumulation in the dermis that disrupts barrier architecture and compounds any existing eczema tendency.
What thyroid conditions are linked to psoriasis and eczema?
The strongest links involve autoimmune thyroid conditions, including:
Hashimoto’s thyroiditis
(an underactive thyroid caused by autoimmunity)
Graves’ disease
(an overactive thyroid caused by autoimmunity)
Because psoriasis is also immune-mediated, overlap between these conditions is relatively common.
Is psoriasis linked to thyroid disease?
The strongest link is between psoriasis and autoimmune thyroid disease — particularly Hashimoto's thyroiditis (chronic autoimmune hypothyroidism) and Graves' disease (autoimmune hyperthyroidism). Multiple published studies have found that people with psoriasis have significantly higher rates of autoimmune thyroid disease than the general population. A systematic review found thyroid autoimmunity prevalence considerably higher in psoriasis patients than in healthy controls.
The explanation lies in shared immune mechanisms. Both psoriasis and autoimmune thyroid disease involve dysregulation of T-cell-mediated immunity. The Th1/Th17 immune pathways that drive psoriatic inflammation are also implicated in autoimmune thyroid destruction. Elevated pro-inflammatory cytokines — including TNF-α and interferon-gamma — are found in both conditions. People with one autoimmune condition are at elevated risk of developing others, and autoimmune thyroid disease sits in a cluster with psoriasis, psoriatic arthritis, and inflammatory bowel disease that are more likely to co-occur.
The practical implication: if you have psoriasis, it is worth discussing thyroid antibody testing with your GP if you have any symptoms of thyroid dysfunction — not because treating thyroid disease will clear psoriasis, but because an undetected thyroid condition may be contributing to systemic inflammatory load and is independently worth managing.
Research suggests:
people with psoriasis have higher rates of autoimmune thyroid disease
thyroid dysfunction may increase inflammation and immune dysregulation
psoriatic arthritis may show an even stronger thyroid connection (frontiersin.org)
However the relationship is complex and still being researched.
What about eczema and thyroid problems?
The eczema-thyroid connection is less well-established than the psoriasis link, but the mechanisms are specific. Hypothyroidism produces skin that overlaps significantly with eczema: persistent dryness, rough texture, itching, and impaired barrier function. This means that in some people, worsening eczema may partly reflect an underlying thyroid insufficiency — particularly if accompanied by other hypothyroid symptoms (fatigue, cold intolerance, weight gain, hair thinning, low mood).
Hypothyroidism reduces the skin's ability to maintain hydration through two routes: reduced sebum production leaves skin less lubricated, and reduced sweating impairs the natural humectant function of perspiration. Both effects compound the transepidermal water loss problem central to eczema-prone skin.
The link is less established than psoriasis—but there may still be overlap.
Some research suggests:
eczema is more common in people with autoimmune conditions
hypothyroidism may worsen:
skin dryness
itching
skin barrier function
This can make eczema symptoms feel worse or harder to manage.
The bidirectional complexity: drugs, hormones, and skin
Some medications for thyroid conditions affect skin. Carbimazole and propylthiouracil, used to treat hyperthyroidism, have rash as a documented side effect. Getting levothyroxine dose right matters for skin — both over-replacement (effectively hyperthyroid) and under-replacement (effectively hypothyroid) affect skin differently.
In the other direction, high-dose biotin supplementation — which some people with skin conditions take — can interfere with thyroid function tests, producing falsely abnormal results. As covered in the biotin article in this series: if you supplement with high-dose biotin (over 1,000mcg) and are having thyroid function tested, inform your GP and stop supplementing 48–72 hours before the test.
Some psoriasis treatments also have thyroid-relevant interactions. Lithium — occasionally used — is a known cause of hypothyroidism and thyroiditis. Biologics targeting TNF-α have been associated with thyroid autoimmunity in some reported cases. These are specialist prescribing considerations worth knowing if you're on systemic psoriasis treatment.
Selenium: the nutrient connecting thyroid and skin health
Selenium is an essential trace mineral most concentrated in the thyroid gland of any organ in the body. It is required for the synthesis and activation of thyroid hormones — specifically the selenoprotein deiodinases that convert T4 to the more active T3. Selenium also provides antioxidant protection to the thyroid through glutathione peroxidase enzymes.
Selenium deficiency is associated with impaired thyroid function and linked to higher levels of thyroid peroxidase antibodies (anti-TPO) — the antibodies involved in Hashimoto's thyroiditis. Some clinical trials have found that selenium supplementation in Hashimoto's patients reduces anti-TPO antibody levels. For skin health, selenium also contributes antioxidant defence relevant to the oxidative stress component of both eczema and psoriasis.
Recommended Products
Nature's Best Selenium 200µg
selenomethionine, the organic form with best bioavailability. 200µg is within safe parameters and the dose used in most Hashimoto's antibody research. Relevant for people with confirmed or suspected autoimmune thyroid disease alongside psoriasis or eczema.
Vimergy Organic Liquid Zinc Sulphate
zinc is required for the conversion of T4 to T3 (the active thyroid hormone) and zinc deficiency is both a consequence and a contributor to hypothyroid dysfunction. As covered above, this creates a compounding loop that makes zinc repletion specifically relevant for people with thyroid-related skin conditions alongside the general eczema and psoriasis evidence for zinc covered in this series. Liquid format provides flexible dosing.
How thyroid imbalance may worsen skin symptoms
1. Increased dryness
Low thyroid hormone levels reduce:
oil production
sweating
skin hydration
Dry skin is one of the most common thyroid symptoms.
2. Increased inflammation
Autoimmune thyroid disease may contribute to chronic inflammation.
3. Skin barrier dysfunction
Weakened barrier function can worsen:
eczema irritation
psoriasis scaling
4. Stress and hormonal effects
Thyroid disorders can also affect:
sleep
stress levels
mood
All of which can trigger flare-ups.
When to discuss thyroid testing with your GP
Thyroid dysfunction is worth investigating if you have skin symptoms alongside: persistent unexplained fatigue or cold sensitivity; unintentional weight changes; hair thinning, particularly from the outer third of the eyebrows (a specific hypothyroid pattern); a palpable swelling in the neck; mood changes disproportionate to circumstances; or skin that remains persistently dry despite consistent emollient use and good skincare, particularly alongside other symptoms above.
Standard tests are TSH and free T4. If autoimmune thyroid disease is specifically suspected — particularly with psoriasis — thyroid peroxidase antibody (anti-TPO) testing provides additional information. Both are routinely available through NHS GP testing.
Does treating thyroid disease improve eczema or psoriasis?
Sometimes, partially, and not always. For hypothyroidism-related skin dryness and itching, levothyroxine replacement typically improves these symptoms as thyroid levels are restored. For the underlying eczema or psoriasis — which has its own immune and genetic drivers — thyroid treatment alone is rarely sufficient. Managing both conditions through their respective appropriate treatments remains the most effective approach.
Signs your thyroid may be affecting your skin
You may want to discuss thyroid testing if you have:
persistent fatigue
unexplained weight changes
cold sensitivity
hair thinning
very dry skin
worsening autoimmune symptoms
Especially if skin symptoms feel difficult to control.
Skin support for eczema & psoriasis-prone skin
Whether or not thyroid dysfunction is contributing to your skin condition, the nutritional foundations relevant to eczema and psoriasis remain consistent: zinc for immune regulation and barrier function, vitamin D for immune modulation, magnesium for inflammatory balance, and selenium for antioxidant protection linking thyroid and skin health.
Drought's Skin Support Formula provides 14 nutrients selected for their roles in skin health — addressing the internal nutritional foundations that topical skincare and thyroid treatment alone don't cover. Made in the UK, suitable for vegetarians, designed for consistent long-term daily use. For those with autoimmune thyroid disease alongside skin conditions, discussing selenium supplementation specifically with your GP is a worthwhile additional step.
FAQs: Thyroid, eczema & psoriasis
Can thyroid problems cause eczema?
Hypothyroidism can worsen skin dryness, itching, and barrier function in ways that mimic or exacerbate eczema. It doesn't directly cause atopic eczema, but can significantly worsen an existing tendency.
Is psoriasis linked to thyroid disease?
Yes — particularly autoimmune thyroid conditions. People with psoriasis have significantly higher rates of thyroid autoimmunity than the general population, reflecting shared immune pathways.
Can thyroid medication improve psoriasis?
Not reliably. Thyroid treatment typically improves thyroid-driven skin symptoms but psoriasis has its own immune drivers that require separate management.
Should people with psoriasis get thyroid testing?
Discuss with your GP, particularly if you have symptoms of thyroid dysfunction. Thyroid antibody testing (anti-TPO) is worth considering given elevated prevalence of thyroid autoimmunity in psoriasis.
Does high-dose biotin interfere with thyroid tests?
Yes — high-dose biotin supplementation can produce falsely abnormal thyroid function test results. Stop supplementing 48–72 hours before any thyroid blood test and inform your GP.
What is selenium's role in thyroid and skin health?
Selenium is essential for thyroid hormone activation and provides antioxidant protection through glutathione peroxidase. Deficiency is associated with higher thyroid antibody levels in Hashimoto's, and it also contributes to antioxidant defence in skin.
Final thoughts
The connection between thyroid disease and eczema or psoriasis is real, documented, and mechanistically grounded — particularly the link between autoimmune thyroid conditions and psoriasis through shared T-cell immune pathways. Hypothyroidism produces skin changes that directly worsen eczema presentations through reduced sebum, impaired barrier function, and shifting inflammatory balance. But thyroid dysfunction is rarely the sole driver of either condition, and treating it doesn't reliably resolve skin symptoms. The most productive approach treats both conditions through their own appropriate management while addressing the nutritional foundations — including selenium — that connect thyroid health and skin health.
The thyroid plays an important role in skin health, inflammation, and immune balance—which is why thyroid disorders are often linked to eczema and psoriasis.
But while thyroid dysfunction may contribute to flare-ups, it’s rarely the only cause.
The most effective long-term approach supports your skin across multiple pathways—not just hormones alone.
Start your skin support journey →
Written by the Drought Skin team — specialists in natural support for eczema and psoriasis.
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