Inflammation and Hypothyroidism: The Root Cause You Need to Know
When you think about hypothyroidism, you probably picture symptoms like fatigue, weight gain, hair loss, or feeling cold all the time. But did you know that inflammation is both a cause and a consequence of hypothyroidism?
Understanding this link can help you see why thyroid health is about more than just hormone levels—and why addressing inflammation may improve not only your thyroid but also your overall health.
The Connection Between Inflammation and Hypothyroidism
A Two-Way Street
Research shows that inflammation and hypothyroidism fuel each other. Certain inflammatory molecules in your body—like IL-7 and MIP-1β—can raise your risk of developing hypothyroidism. On the other hand, once hypothyroidism develops, it triggers increases in other inflammatory markers like IL-6 and TNF-α (Lai et al., 2024).
In other words, inflammation doesn’t just show up after your thyroid slows down. It may actually be part of the problem from the very beginning.
Higher Inflammation Levels in Hypothyroidism
If you have hypothyroidism—even in its milder form (called subclinical hypothyroidism)—your body often shows signs of higher inflammation. Studies consistently find elevated levels of:
- C-reactive protein (CRP)
- Interleukin-6 (IL-6)
- Tumor necrosis factor alpha (TNF-α)
These inflammatory markers are linked to blood vessel damage, higher cardiovascular risk, and problems with the lining of your blood vessels (Tellechea, 2020; Gupta et al., 2015; Torres & Tellechea, 2024; Türemen et al., 2011).
How Inflammation Affects Organs
Inflammation in hypothyroidism doesn’t just stay in the blood—it shows up in your organs too. Studies in animals and humans reveal more immune cell activity and “sterile inflammation” in the heart, pancreas, and even reproductive tissues like the ovaries and testes (Sahin et al., 2019; Rodríguez-Castelán et al., 2019; Rojas-Juárez et al., 2024).
This kind of tissue inflammation can lead to:
- Heart problems (cardiovascular disease, heart attacks)
- Metabolic changes (insulin resistance, weight gain, diabetes, high cholesterol, hypertension)
- Reproductive changes (menstrual irregularities, uterine inflammation, endometriosis, fibroids, infertility, menopausal disturbances)
So, if you’ve noticed that hypothyroidism seems to affect more than just your energy levels, inflammation may be the missing link.
What This Means for Your Health
Inflammation in hypothyroidism is tied to conditions like:
- Dyslipidemia (imbalances in cholesterol and blood fats)
- Atherosclerosis (plaque buildup in arteries)
- Cardiovascular disease (leading to heart attacks and strokes)
Interestingly, thyroid treatment with levothyroxine may help lower some of these inflammatory markers, though results vary depending on how severe the disease is and what other health conditions you have (Tellechea, 2020; Mikulska et al., 2022). However, addressing what is causing the inflammation in terms of diet, sleep, stress and other lifestyle inputs can be an extremely powerful strategy that is worth exploring as well.
Key Inflammatory Markers in Hypothyroidism
|
Marker |
What Happens in Hypothyroidism |
Why It Matters |
References |
|
CRP |
Elevated |
Higher cardiovascular risk |
Tellechea, 2020; Gupta et al., 2015; Torres & Tellechea, 2024; Türemen et al., 2011 |
|
IL-6 |
Elevated |
Damage to blood vessels |
Lai et al., 2024; Gupta et al., 2015; Torres & Tellechea, 2024; Nagila et al., 2024 |
|
TNF-α |
Elevated |
Chronic systemic inflammation |
Lai et al., 2024; Tellechea, 2020; Gupta et al., 2015; Torres & Tellechea, 2024 |
|
IL-7, MIP-1β |
Contribute to thyroid dysfunction |
Can set off hypothyroidism in the first place |
Lai et al., 2024 |
NOTE: Most of these markers cannot be tested by doctors and are only available in research settings. While there are blood markers that can be tested by your doctor (watch this VIDEO to understand more), the main takeaway here is that addressing inflammation with anti-inflammatory strategies could be very helpful for your thyroid and whole body health.
The Takeaway
Inflammation and hypothyroidism are deeply connected. Not only can inflammation set the stage for thyroid problems, but hypothyroidism also makes inflammation worse, which can harm your heart, blood vessels, and metabolism.
If you’re living with hypothyroidism, it’s worth exploring ways to manage inflammation—through strategies such as an anti-inflammatory diet, lifestyle changes, and supplements. Addressing inflammation may help you protect not only your thyroid health but also your long-term well-being.
🔥 Ready to take action? Explore my Inflammation Playlist on YouTube—covering everything from root causes to diet, supplements & anti-inflammatory habits to support a healthier thyroid.
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References
- Lai, R., Yin, B., Feng, Z., Deng, X., Lv, X., Zhong, Y., & Peng, D. (2024). The causal relationship between 41 inflammatory cytokines and hypothyroidism: bidirectional two-sample Mendelian randomization study. Frontiers in Endocrinology, 14. https://doi.org/10.3389/fendo.2023.1332383
- Tellechea, M. (2020). Meta-analytic evidence for increased low-grade systemic inflammation and oxidative stress in hypothyroid patients. Can levothyroxine replacement therapy mitigate the burden?. Endocrine, 72, 62-71. https://doi.org/10.1007/s12020-020-02484-1
- Gupta, G., Sharma, P., Kumar, P., & Itagappa, M. (2015). Study on Subclinical Hypothyroidism and its Association with Various Inflammatory Markers. Journal of Clinical and Diagnostic Research, 9(11), BC04-6. https://doi.org/10.7860/JCDR/2015/14640.6806
- Torres, E., & Tellechea, M. (2024). Biomarkers of endothelial dysfunction and cytokine levels in hypothyroidism: a series of meta-analyses. Expert Review of Endocrinology & Metabolism, 20, 119-128. https://doi.org/10.1080/17446651.2024.2438997
- Nagila, A., Paudel, K., & Subedi, B. (2024). Interleukin-6 in Hypothyroidism. Journal of Manmohan Memorial Institute of Health Sciences. https://doi.org/10.3126/jmmihs.v9i2.71838
- Sahin, E., Bektur, E., Bayçu, C., Dönmez, D., & Kaygısız, B. (2019). Hypothyroidism increases expression of sterile inflammation proteins in rat heart tissue. Acta Endocrinologica, 15(1), 39-45. https://doi.org/10.4183/aeb.2019.39
- Rodríguez-Castelán, J., Del Moral-Morales, A., Piña-Medina, A., Zepeda-Pérez, D., Castillo-Romano, M., Méndez-Tepepa, M., Espíndola-Lozano, M., Camacho-Arroyo, I., & Cuevas-Romero, E. (2019). Hypothyroidism induces uterine hyperplasia and inflammation related to sex hormone receptor expression in virgin rabbits. Life Sciences, 230, 111-120. https://doi.org/10.1016/j.lfs.2019.05.063
- Rojas-Juárez, R., Rodríguez-Castelán, J., Cuatecontzi-Fuentes, I., Méndez-Tepepa, M., Cruz-Lumbreras, R., Rodríguez-Antolín, J., Arroyo-Helguera, O., & Cuevas-Romero, E. (2024). Pancreatic inflammation induced by hypothyroidism in female rabbits is associated with cholesterol accumulation and a reduced expression of CYP51A1, FXRβ, and PPARβ/δ. The Anatomical Record, 308, 1517-1528. https://doi.org/10.1002/ar.25590
- Türemen, E., Çetinarslan, B., Şahin, T., Cantürk, Z., & Tarkun, I. (2011). Endothelial dysfunction and low grade chronic inflammation in subclinical hypothyroidism due to autoimmune thyroiditis. Endocrine Journal, 58(5), 349-354. https://doi.org/10.1507/ENDOCRJ.K10E-333
- Mikulska, A., Karaźniewicz-Łada, M., Filipowicz, D., Ruchała, M., & Główka, F. (2022). Metabolic characteristics of Hashimoto’s thyroiditis patients and the role of microelements and diet in the disease management—An overview. International Journal of Molecular Sciences, 23. https://doi.org/10.3390/ijms23126580
- Biondi, B. (2023). Subclinical hypothyroidism in patients with obesity and metabolic syndrome: A narrative review. Nutrients, 16. https://doi.org/10.3390/nu16010087
- Gluvić, Z., Zafirovic, S., Obradović, M., Sudar-Milovanovic, E., Rizzo, M., & Isenovic, E. (2022). Hypothyroidism and risk of cardiovascular disease. Current Pharmaceutical Design. https://doi.org/10.2174/1381612828666220620160516
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