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Getting to Know Your Thyroid
Immune Health · Thyroid
The thyroid gland is a small but powerful organ. This butterfly-shaped gland, located below the Adam's apple in the neck, regulates many essential functions throughout the body. From metabolism and heart rate to body temperature and gastrointestinal function, the thyroid plays a vital role in maintaining overall health.
In recent years, awareness and diagnosis of thyroid-related conditions—including thyroid cancer, hypothyroidism, and hyperthyroidism—have increased. Recognizing the importance of understanding the thyroid gland and its functions can help you feel more confident in managing your health and seeking appropriate care.
The Thyroid Gland: What It Is and What It Does
The thyroid gland is a small, butterfly-shaped organ located in the front of the neck below the Adam's apple. It contains follicles that store thyroid hormones. Thyroid hormone production requires two key components: the amino acid tyrosine and iodine. When thyroid hormone levels decrease, the pituitary gland releases thyroid-stimulating hormone (TSH), signaling the thyroid gland to increase production of thyroid hormones, primarily T3 and T4, as needed. (1)
Hormones Produced by the Thyroid Gland (1)
- Thyroxine (T4): The primary hormone released by the thyroid gland. T4 is relatively inactive and is converted into the more active hormone T3 in body tissues.
- Triiodothyronine (T3): The active thyroid hormone that directly affects metabolic activity throughout the body.
- Calcitonin: Produced by specialized thyroid C-cells in smaller amounts and involved in regulating calcium levels in the blood and bones.
The thyroid gland influences nearly every organ system in the body:
Metabolic Rate
Controls how efficiently the body converts calories and oxygen into energy, helping regulate basal metabolic rate.
Heart Rate & Blood Pressure
Influences heart rate, strength of heart contractions, and blood vessel resistance.
Body Temperature
Helps determine how much heat the body produces through metabolic activity.
Brain Development & Mood
Essential for normal brain development in infants and children and supports cognitive function, mood, and mental processing in adults.
Growth & Tissue Repair
Works with growth hormone and other systems to support growth, cell turnover, muscle function, and bone development.
Digestive Function
Helps regulate gastrointestinal motility and the speed at which food moves through the digestive tract.
Triggers Leading to Thyroid Dysfunction (2)
Thyroid dysfunction can result from autoimmune conditions, medications, medical treatments, inflammation, structural changes, genetic factors, and other environmental influences.
Autoimmune Conditions (Most Common)
- Hashimoto's Thyroiditis: The immune system mistakenly attacks thyroid tissue, causing inflammation and gradual destruction of thyroid hormone-producing cells. Over time, this can lead to hypothyroidism.
- Graves' Disease: The immune system produces antibodies that overstimulate the thyroid gland, resulting in excessive thyroid hormone production (hyperthyroidism).
Medications, Treatments & Inflammation
- Prescription Medications: Certain medications, including lithium, amiodarone, and some cancer immunotherapies, can affect thyroid hormone production or regulation.
- Radiation Therapy: Radiation involving the head, neck, or chest may damage thyroid tissue.
- Surgical Removal: Partial or complete removal of the thyroid gland (thyroidectomy) reduces or eliminates thyroid hormone production.
- Infection or Inflammation: Viral or bacterial infections may trigger temporary thyroid inflammation, sometimes causing a temporary hyperthyroid phase followed by hypothyroidism.
- Postpartum Thyroiditis: Hormonal changes following pregnancy can trigger temporary thyroid inflammation in some women.
Damage or disorders affecting the brain's thyroid-regulating centers, such as pituitary adenomas, may disrupt TSH signaling and impair communication between the brain and the thyroid gland. Noncancerous thyroid nodules or multinodular goiters may occasionally become "toxic," meaning they produce excess thyroid hormone independently of normal thyroid regulation. A family history of thyroid disease also increases the risk of developing thyroid disorders.
A Possible Trigger: Spike Protein
Some studies have investigated possible associations between SARS-CoV-2 infection, COVID-19 vaccination, and thyroid inflammation or autoimmune thyroid conditions. (3) Research has reported that viral antigens, including spike protein components, may persist for up to 3 years; however, the clinical significance of this finding and its relationship to thyroid dysfunction remain areas of ongoing research. (4)
Is It Thyroiditis or an Autoimmune Condition?
Hashimoto's thyroiditis is an autoimmune condition in which the immune system attacks thyroid tissue. In some individuals, a temporary hyperthyroid phase (known as hashitoxicosis) may occur when damaged thyroid cells release stored thyroid hormone into the bloodstream. As thyroid hormone stores become depleted, hypothyroidism may develop. (5)
Hashimoto's: Symptoms & Diagnosis
- Symptoms may include cold intolerance, weight gain, fatigue, depression, dry skin, and constipation.
- Diagnosed through a combination of symptoms, physical examination, and blood tests, including TSH, Free T4, Free T3 (when indicated), and thyroid peroxidase (TPO) antibodies. Additional testing may be ordered depending on clinical findings.
Graves' disease is an autoimmune form of hyperthyroidism. Unlike Hashimoto's disease, which typically damages thyroid cells, Graves' antibodies stimulate the thyroid gland, causing excessive thyroid hormone production. In rare cases, a life-threatening complication called thyroid storm can occur and requires immediate medical attention. (5)
Graves' Disease: Symptoms & Diagnosis
- Symptoms may include bulging eyes (Graves' ophthalmopathy), rapid heartbeat, anxiety or nervousness, heat intolerance, and increased sweating.
- May be diagnosed using TSH, T3, and T4 levels; thyroid-stimulating immunoglobulin (TSI) or thyrotropin receptor antibodies (TRAb); radioactive iodine uptake testing; and thyroid imaging when appropriate.
Inflammatory thyroiditis, including subacute thyroiditis (de Quervain's thyroiditis), may present with symptoms similar to autoimmune thyroid disease, including fatigue, weight changes, and a temporary hyperthyroid phase followed by hypothyroid symptoms. It is often temporary and may resolve over weeks to months, though in some individuals thyroid damage may contribute to long-term dysfunction. (5)
Inflammatory Thyroiditis: Triggers & Diagnosis
- Possible triggers include viral infections such as influenza or SARS-CoV-2, bacterial infections, certain medications, surgery, radiation exposure, trauma, and postpartum hormonal changes.
- Evaluation may include thyroid function tests (TSH, T4, T3), thyroid antibody testing, inflammatory markers such as C-reactive protein (CRP), and thyroid ultrasound when structural abnormalities are suspected.
Suggested Protocol for Sudden-Onset Thyroid Symptoms
If sudden thyroid symptoms develop, evaluation may include a comprehensive medical history and physical examination, along with thyroid blood testing and additional testing recommended by a healthcare provider.
Suggested Thyroid-Related Testing
- TSH (thyroid-stimulating hormone)
- Free T4 and Free T3 when indicated
- Thyroid antibody testing based on symptoms and clinical findings
- Additional testing related to thyroid function as recommended by a healthcare provider
- Spike antibody testing: high levels could indicate thyroid conditions. For more information, check out reference #6.
Other laboratory evaluations may include nutrient or metabolic assessments when clinically appropriate.
Know Your Thyroid, Know Your Options
Thyroid symptoms can stem from a wide range of causes—autoimmune disease, medication effects, infection, structural changes, and emerging factors like spike protein persistence among them. Because these causes require very different approaches, the clearest path forward is proper testing and evaluation with a qualified healthcare provider who can pinpoint what's actually driving your symptoms and guide the right next steps.
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References
- National Library of Medicine. (2024, April 22). Thyroid diseases. MedlinePlus.
- National Library of Medicine. (2024, April 22). Thyroid diseases. MedlinePlus.
- Rodina L, Monescu V, Caplan LG, Cocuz ME, Bîrluțiu V. Post-COVID-19 Thyroid Dysfunction and Autoimmune Ultrasound Changes: A 12-Month Prospective Cohort Study. Medicina (Kaunas). 2026 Jul 14;62(7):1354.
- Hulscher, N., Schmidt, V., Mörz, M., Rogers, C., von Ranke, N., Zhang, W., Catanzaro, J. A., & McCullough, P. A. (2026). Persistence of vaccine mRNA, plasmid DNA, spike protein, and genomic dysregulation over 3.5 years post-COVID-19 mRNA vaccination [Preprint]. Zenodo.
- National Institute of Diabetes and Digestive and Kidney Diseases. (2021, April). Hashimoto's disease. U.S. Department of Health and Human Services, National Institutes of Health.
- McCullough, P. A. (2026, February 27). Guide to understanding the spike protein effect. Focal Points.
Author
The information in this blog is provided for educational purposes only and is not intended to diagnose, treat, or prevent any illness or medical condition. Always consult a qualified healthcare provider for evaluation and treatment of thyroid symptoms or other health concerns.
