What Your TSH Number Isn't Telling You ft. Dr. Brittany Henderson

Your TSH can look "perfectly normal" and you can still feel exhausted, foggy, cold, and stuck at a weight that won't budge.

In this episode of the Medical Disruptor, I sit down with thyroid specialist Dr. Brittany Henderson to find out why.

Dr. Henderson is fellowship-trained at Duke, ran thyroid programs at two major academic centers, and now runs her own thyroid-only practice, the Charleston Thyroid Center. She told me flat out that TSH alone is not enough, and that most doctors don't even know how to read a full thyroid panel.

In this conversation we get into why TSH is actually a pituitary hormone, not a thyroid hormone, and why the "normal" TSH reference range was built on flawed population data that included undiagnosed Hashimoto's patients. I ask her what free T4, free T3, and reverse T3 actually reveal that TSH can't, and she walks me through why muscle mass is the missing piece in thyroid hormone conversion, since it's muscle tissue that activates T4 into usable T3.

She also explains why up to 95% of people with severe Hashimoto's or a thyroidectomy may need combination T4/T3 therapy instead of T4 alone, and we break down the real differences between levothyroxine, desiccated thyroid extract, and combination treatment.

We talk about patients who've been on the wrong thyroid medication for decades and what happens when it's finally corrected, plus the flip side: patients who never needed thyroid medication in the first place and how to tell the difference. Along the way we cover how birth control, inflammation, steroids, and menopause quietly throw off your thyroid labs without anyone telling you.

If you've ever been told your thyroid is fine while your body is telling you otherwise, this episode gives you the exact labs to ask for and the language to ask for them.

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Chapters

0:00 - Introduction

2:10 - From Duke-Trained Endocrinologist to Questioning the Standard of Care

12:38 - Why TSH Alone Is Not Enough