10/15/2026
Part 8: How chronic inflammation drives chronic pain
Normal thyroid labs and feeling completely run down can both be true at once, and the standard test is part of why it gets missed.
Your thyroid mostly produces T4, a storage form that does very little until tissue enzymes convert it into T3, the version that actually runs your cells. Chronic inflammation interferes with that conversion. Cytokines like IL-6, TNF-alpha, and IL-1 slow those enzymes down and activate a different one called D3, which reroutes T4 into reverse T3, an inactive form that does nothing useful. A standard screen usually only checks TSH, a brain hormone, not a thyroid hormone, so everything can read normal while your tissues are starved of active T3. Repair slows, muscles ache, and recovery drags.
S*x hormones take a similar hit. The same inflammatory cytokines switch on aromatase, which converts testosterone into estrogen, especially in fat and inflamed connective tissue, while also dampening the brain's signal to produce testosterone, a hormone with pain-dampening effects of its own.
Replacing a hormone helps when it's genuinely low, but if inflammation is the reason conversion is clamped down, replacing the end product without addressing that leaves the underlying loop still running. Upstream, selenium is a key nutrient for these conversion enzymes, alongside enough calories and protein, good sleep, and cooling inflammation itself.
Normal labs don't always mean normal function. Has that gap between "your labs are fine" and how you actually feel ever been dismissed by a provider?