What is Thyroid-Stimulating Hormone?
Thyroid-stimulating hormone (TSH) is a messenger hormone released by the pituitary gland in your brain. It regulates the thyroid, a small, butterfly-shaped gland located in the front of your neck.
When TSH levels are balanced, it reflects healthy communication between your brain and thyroid, helping keep your energy, metabolism, and mood steady.
If thyroid hormone levels fall, TSH rises to stimulate more production. If thyroid hormone levels are high, TSH drops.
Why Does TSH Matter?
- Regulates metabolism by controlling how much thyroid hormone is available to drive cellular energy production.
- Supports healthy heart rhythm by regulating thyroid hormone activity in cardiac tissue
- Helps manage glucose metabolism by affecting how much glucose the liver releases and how efficiently cells use it for energy.
- Enhances energy by increasing the number and activity of mitochondria, your cells’ energy generators
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How to Interpret TSH
(Ranges may vary slightly by lab)
Standard reference ranges represent the middle 95% of healthy individuals but don’t necessarily reflect levels associated with longevity. Optimal ranges are derived from clinical guidelines, peer-reviewed research, and real-world outcomes data, with an emphasis on levels associated with peak functioning and reduced disease risk.
Benefits of Optimizing TSH
- Increased energy
- Improved metabolism
- Healthier heart rate, blood pressure, and cholesterol levels
- Improved hair, skin, and nail health
- Better reproductive health
- Better sleep quality
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Low TSH Levels
Low TSH levels may signal an overactive thyroid.
Symptoms:
- Rapid and irregular heartbeat
- Unexplained weight loss
- Increased appetite
- Anxiety
- Frequent bowel movements
- Heat sensitivity
- Lighter or less frequent periods
Causes:
- Hyperthyroidism
- Graves’ disease
- Pituitary gland issues
- Pregnancy
- Excess thyroid medication
Healthspan impacts:
High TSH Levels
Elevated TSH levels typically reflect an underactive thyroid.
Symptoms:
- Fatigue
- Unexplained weight gain
- Cold intolerance
- Depression
- Hair loss, dry skin
- Irregular or heavy periods
Causes:
- Hypothyroidism
- Hashimoto’s disease
- Iodine deficiency
- Pituitary issues
- Certain medications (e.g., lithium, anti-seizure meds)
- Thyroiditis
Healthspan impacts:
- Accelerated biological aging3
- Increased risk of cardiovascular disease and reduced quality of life4
- Associated with cognitive decline5
- Higher prevalence of depression and anxiety
- Increased fracture risk
How Hone Treats Out of Range TSH
Your Hone physician will evaluate your TSH results from a blood test along with other thyroid markers such as T3 and T4, your symptoms, and health history to recommend lifestyle changes and medications as needed.
Kim, J.W., et al. (2025). Low Thyrotropin Levels Are Associated With an Increased Risk of Atherosclerotic Cardiovascular Disease in Euthyroid Individuals: The Korea National Health and Nutrition Examination Survey 2013–2015. Journal of Lipid and Atherosclerosis.
↑Aggarwal, N., & Razvi, S. (2013). Thyroid and Aging or the Aging Thyroid? An Evidence-Based Analysis of the Literature. Journal of Thyroid Research.
↑Yang, D., et al. (2025). Assessing thyroid health: Phenotypic age compared to chronological age. Frontiers in Endocrinology.
↑Zúñiga, D., et al. (2024). Hypothyroidism and Cardiovascular Disease: A Review. Cureus.
↑Pasqualetti, G., et al. (2015). Subclinical Hypothyroidism and Cognitive Impairment: Systematic Review and Meta-Analysis. The Journal of Clinical Endocrinology & Metabolism.
↑Huwiler, V.V., et al. (2024). Selenium Supplementation in Patients with Hashimoto Thyroiditis: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Thyroid.
↑Mahmoodianfard S, et al. (2015). Effects of Zinc and Selenium Supplementation on Thyroid Function in Overweight and Obese Hypothyroid Female Patients: A Randomized Double-Blind Controlled Trial. J Am Coll Nutr.
↑Wang, K., et al. (2018). Severely low serum magnesium is associated with increased risks of positive anti-thyroglobulin antibody and hypothyroidism: A cross-sectional study. Scientific Reports.
↑Aktaş, H. Ş. (2019). Vitamin B12 and Vitamin D Levels in Patients with Autoimmune Hypothyroidism and Their Correlation with Anti-Thyroid Peroxidase Antibodies. Medical Principles and Practice.
↑Bhandari, R. B., & Mahto, P. K. (2024). Effect of Yoga Therapy on Hypothyroidism: A Systematic Review. Annals of Neurosciences.
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Reviewed for Accuracy by Our Medical Review Board
This biomarker information has been reviewed by a member of Hone’s medical review board. As part of the medical review team, physicians fact-check this content against the latest research and their own experience treating their patients.
Ashley Winter, M.D., is a board-certified urogynecologist trained at Weill Cornell and Cleveland Clinic. She specializes in female and male sexual dysfunction, urinary issues, genital pain, and hormone therapy.
James Staheli, D.O., is the Medical Director for Broad Health, Hone Health’s affiliated medical practice and a family medicine doctor in Atlanta, Georgia.
