Leigh Erin Connealy, M.D. on Instagram: "Most people who get their thyroid checked only have TSH (thyroid-stimulating hormone) measured. The problem is that TSH is not a thyroid hormone— it’s a pituitary hormone. It reflects how the brain is signaling the thyroid, not how much usable thyroid hormone is actually available in the body. You can think of it like checking the thermostat instead of the furnace: just because the thermostat says “heat is on” doesn’t mean the house is warm. A full thyroi

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