You were told your thyroid was tested and it came back normal. But you're still bone-tired by mid-afternoon, foggy, losing hair in the shower, and watching a scale that won't move. Here's the detail almost nobody mentions at that appointment: "a thyroid test" usually means exactly one number got checked.

In this episode, Rachel explains what that one number, TSH, actually measures. TSH is the signal your brain sends to your thyroid, the request, not the response. Everything that determines how you feel happens further down the chain, and TSH cannot see any of it. That is how a woman can carry a folder of normal labs while the active hormone her cells run on quietly runs low.

What you'll hear:

- What "we checked your thyroid" almost always means, and why the conversation usually stops at one number

- Why a normal TSH is a s ...