About
Dr. Tania Tyles Dempsey earned her MD from The Johns Hopkins University School of Medicine and her BS from Cornell University. She completed her internal medicine residency at NYU Medical Center. She holds board certification in both Internal Medicine and Integrative and Holistic Medicine through ABIHM.
Dr. Dempsey built her practice around functional medicine principles, seeking root causes in patients with conditions that resist conventional diagnosis. She is internationally recognized for her expertise in MCAS, dysautonomia, Lyme disease, mold illness, and neuroinflammation. She serves on the Board of Directors of ILADS and teaches in their Vector-Borne Illness Fundamentals course. org. In July 2025, she co-authored a paper on GLP-1 receptor agonists in MCAS in The American Journal of the Medical Sciences. She hosts the Mast Cell Matters podcast, a monthly feature of The POTScast by Standing Up to POTS. Outside medicine, Dr. Dempsey is a competitive bodybuilder with a personal focus on nutrition, supplementation, and sleep optimization.
Education & Training
Undergraduate
BS, Cornell University
Medical School
MD, The Johns Hopkins University School of Medicine
Residency
Internal Medicine, NYU Medical Center
Certifications
Conditions Treated
Who is Dr. Dempsey right for?
Dr. Dempsey is best suited for patients with complex, difficult-to-diagnose chronic conditions. Adults managing MCAS, dysautonomia, Lyme disease, mold illness, or neuroinflammation will find her depth of expertise valuable. She works well with patients who have seen multiple providers without resolution. Her functional medicine approach focuses on finding root causes rather than managing symptoms alone.
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Frequently Asked Questions
Dr. Dempsey specializes in Mast Cell Activation Syndrome, dysautonomia, Lyme disease, mold illness, and neuroinflammation. She also treats autoimmune disease and environmental toxicity. Her functional medicine approach targets root causes in patients whose conditions have resisted conventional diagnosis.
Yes. Dr. Dempsey holds board certification in both Internal Medicine and Integrative and Holistic Medicine through ABIHM. She earned her MD from The Johns Hopkins University School of Medicine and completed her residency at NYU Medical Center.
Dr. Dempsey earned her BS from Cornell University and her MD from The Johns Hopkins University School of Medicine. She completed her internal medicine residency at NYU Medical Center.
Yes. In July 2025, Dr. Dempsey co-authored a paper on GLP-1 receptor agonists in MCAS in The American Journal of the Medical Sciences. She also contributes to medical education through ILADS, where she serves on the Board of Directors and teaches in their Vector-Borne Illness Fundamentals course.
Yes. Dr. Dempsey sees patients from across the United States and internationally, including patients from the UK, Israel, Australia, and France. All new patients visit the Purchase, NY location for their initial consultation, examination, and diagnostic testing.
Dr. Dempsey uses a functional medicine framework to identify root causes in patients with chronic or complex conditions. She builds individualized treatment plans that draw on internal medicine, integrative therapies, and advanced diagnostics. She focuses on conditions that often go undiagnosed or undertreated in conventional settings.
Yes. Dr. Dempsey hosts the Mast Cell Matters podcast, a monthly feature of The POTScast by Standing Up to POTS. The podcast covers MCAS and related conditions for patients and clinicians.
Doctor profile last updated March 21, 2026