Thyroid Imbalance Specialists on Long Island
If you’ve been told your thyroid is fine but you’re still exhausted, cold, foggy, and struggling to lose weight — your thyroid might not actually be fine. Standard thyroid testing checks TSH, and that’s often where it stops. TSH is a pituitary signal, not a direct measure of how well your thyroid is producing or converting hormones. It can look normal while the actual hormone picture is anything but.
A thorough thyroid evaluation looks at free T3, free T4, reverse T3, and thyroid antibodies (TPO and TgAb) alongside TSH. This panel shows not just whether the thyroid is producing hormones, but whether those hormones are being properly converted and used — and whether the immune system may be attacking the thyroid in the background.
Patients across Nassau County, Long Island, and New York State can access thyroid evaluation and optimization via telehealth through StackMD — a consultation and a lab order, no office visit required. If optimization is indicated, treatment is calibrated to the full panel and adjusted over time.
Getting started takes under 10 minutes — no in-person visit required.
Condition Focus
Thyroid Imbalance
Free T3, free T4, reverse T3, and antibodies evaluated together — because TSH alone doesn’t tell you whether your thyroid hormones are being produced, converted, and used at the level you need.
6+
Markers in a complete thyroid panel vs. TSH alone
4–6
Weeks to meaningful symptom improvement with optimization
The process
How It Works
Simple steps, clear labs, and a plan built around your actual thyroid function — not just one number.
Schedule a telehealth consultation — no office visit, no waiting room. We meet you where you are.
Complete a comprehensive thyroid panel — TSH, free T3, free T4, reverse T3, TPO antibodies, and TgAb — at a draw site near you.
Receive a personalized optimization protocol — T4, T3/T4 combination, or NDT — matched to your full panel and adjusted based on how you respond.
Signs You May Have a Thyroid Imbalance
These signs often show up together — and they frequently get attributed to stress, aging, or burnout before anyone checks the thyroid properly.
- Fatigue that doesn't improve even with adequate sleep
- Weight gain that doesn't respond to diet or exercise
- Feeling cold all the time — especially cold hands and feet
- Hair thinning, hair loss, or dry and brittle hair
- Dry skin and brittle nails
- Constipation or sluggish digestion
- Brain fog, poor memory, or difficulty concentrating
- Low mood or depression that doesn't have an obvious cause
- Puffy face or swelling, especially around the eyes in the morning
Why patients look deeper
Thyroid dysfunction rarely occurs in isolation. Patients with thyroid imbalance often also experience fatigue, weight gain, brain fog, and hormone imbalance — and these conditions frequently reinforce each other. A complete panel reveals the full picture.
Root causes
What Causes Thyroid Imbalance?
Thyroid dysfunction can originate at the gland itself, in the conversion pathway, or from factors that interfere with how hormones are used — which is why a single TSH number is rarely enough.
Hashimoto's Thyroiditis (Autoimmune)
Hashimoto's is the most common cause of hypothyroidism. The immune system produces antibodies that gradually damage thyroid tissue, reducing its ability to produce hormones. Many people with Hashimoto's have normal TSH for years while antibody-driven damage quietly progresses — which is why antibody testing matters.
Conversion Dysfunction — T4 to T3
The thyroid primarily produces T4, an inactive hormone that must be converted to the active form, T3, in the body's tissues. Chronic stress, nutrient deficiencies, inflammation, and gut dysfunction can all impair this conversion process. A person can have normal T4 levels and still have insufficient active T3 — producing symptoms that TSH testing won't capture.
Nutrient Deficiencies (Selenium, Iodine, Iron, Zinc)
Thyroid hormone production and conversion depend on specific micronutrients. Selenium is essential for T4-to-T3 conversion. Iodine is required for thyroid hormone synthesis. Iron deficiency impairs thyroid peroxidase, the enzyme needed to make thyroid hormones. Identifying and correcting these is often a necessary part of treatment.
Chronic Stress and Cortisol Excess
Elevated cortisol suppresses TSH and impairs T4-to-T3 conversion. It also increases reverse T3 (rT3) — an inactive form that blocks active T3 receptors. Patients under chronic stress often develop functional hypothyroidism that doesn't appear on standard testing.
Gut Dysfunction
A meaningful portion of T4-to-T3 conversion occurs in the gut. Intestinal permeability, dysbiosis, and reduced gut motility can all impair this process. Many patients with persistent hypothyroid symptoms despite normal TSH have gut health as a significant contributing factor.
Estrogen Dominance Affecting Thyroid Binding
Excess estrogen increases thyroid-binding globulin (TBG), the protein that carries thyroid hormones in the blood. More TBG means more bound, inactive hormone and less free T3 available to tissues — producing functional hypothyroidism even with adequate thyroid hormone production.
Medications
Certain medications including lithium, amiodarone, and some cancer therapies can impair thyroid function. Others — calcium, iron supplements, and certain antacids — can interfere with thyroid hormone absorption when taken too close to thyroid medication. Timing and context matter.
Post-Pregnancy Thyroid Changes
Postpartum thyroiditis affects roughly 5–10% of women in the year after delivery. The immune system, suppressed during pregnancy, can reactivate and attack the thyroid — causing an initial hyperthyroid phase followed by hypothyroidism. It often goes undiagnosed in the postpartum period when symptoms are attributed to new-parent fatigue.
How StackMD Evaluates and Optimizes Thyroid Function
The StackMD approach
TSH alone doesn’t tell you whether T4 is converting to T3, whether reverse T3 is blocking receptors, or whether antibodies are silently damaging thyroid tissue. A complete panel does — and that’s where StackMD starts.
Most thyroid evaluations check TSH and stop there. StackMD evaluates the full conversion pathway — free T3, free T4, reverse T3, TPO antibodies, and TgAb — because a “normal” TSH doesn’t mean your thyroid hormones are being produced and converted at the level you need to function optimally. The consultation and lab work are handled via telehealth through StackMD for patients across Nassau County and Long Island. Lab testing can be completed at a draw site near you — no office visit required.
For patients with confirmed thyroid dysfunction or suboptimal conversion, optimization protocols may include T4 monotherapy, T3/T4 combination therapy, or desiccated thyroid (NDT) where appropriate. The choice is based on labs, symptoms, and patient response — not a standard protocol applied uniformly. Nutrient repletion, stress management support, and gut health are addressed as contributing factors where relevant.
Myers Cocktail IV therapy, available through Stack Mobile IV, can provide targeted micronutrient support for thyroid-related fatigue and immune function. StackMD’s focus is on optimization and functional support — patients with newly diagnosed or complex primary thyroid disease are coordinated with appropriate specialists as needed.
"Your TSH is normal" isn't the end of the conversation.
A complete thyroid panel is a simple lab order — and the consultation to interpret it can happen entirely via telehealth. If your symptoms are real, they deserve a real evaluation.
Serving Nassau County, Long Island, and all of New York. No in-person visit required to start.
Common questions
Frequently Asked Questions
Answers to the questions patients usually ask before they get started.
Can I have a thyroid problem if my TSH is normal?
Yes. TSH measures pituitary output, not thyroid hormone availability at the tissue level. A normal TSH doesn’t tell you whether T4 is converting efficiently to T3, whether reverse T3 is blocking active T3 receptors, or whether thyroid antibodies are present. Patients with normal TSH and persistent symptoms deserve a more complete evaluation.
What is Hashimoto's thyroiditis?
What's the difference between T3 and T4?
Can thyroid problems cause weight gain?
Can thyroid dysfunction cause anxiety or depression?
Do I need to come in for thyroid testing and treatment?
Is thyroid medication safe long-term?
Related conditions
Thyroid dysfunction rarely occurs in isolation. Patients with thyroid imbalance often also experience fatigue, weight gain, brain fog, and hormone imbalance — and these conditions frequently reinforce each other.
Fatigue & Low Energy
Search for hormone, thyroid, nutrient, and sleep-related drivers.
Brain Fog
Assess hormones, sleep, metabolic health, and recovery support.
Weight Gain
Look at insulin, appetite, thyroid, and hormones — not calories alone.
Start Your Thyroid Evaluation Today
A complete thyroid panel is a simple lab order — and the consultation to interpret it happens entirely via telehealth. Serving Nassau County, Long Island, and all of New York State.
Telehealth-first · No in-person visit required
Areas Served
StackMD serves patients across New York State via telemedicine — including Nassau County, Suffolk County, and the greater New York metro area. For in-person procedures, we see patients at our Albertson, NY location, serving Garden City, Mineola, Great Neck, Manhasset, Roslyn, Westbury, New Hyde Park, Jericho, Syosset, Port Washington, Massapequa, Hicksville, Levittown, and surrounding Long Island communities.
Medical Disclaimer
This page is for informational purposes only and does not constitute medical advice. Please consult a qualified physician before making any treatment decisions.