Jod-Basedow is the iodine-load hyperthyroidism trap: autonomous thyroid tissue uses sudden iodine repletion to make excess T3/T4 instead of shutting down.
The anchor: Iodine can be a brake or fuel. Normal thyroid gets Wolff-Chaikoff suppression. Autonomous nodules get substrate and overproduce hormone.
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THE VISUAL ANCHOR
Iodine Becomes Fuel
The board move is not simply low uptake. Tie the uptake to iodine saturation, nodular autonomy, and new hormone synthesis.
The Iodine Switch
Iodine DeficiencyChronic scarcity drives goiter and nodular autonomy.
Iodine LoadAmiodarone, contrast, kelp, or iodized diet suddenly supplies substrate.
ThyrotoxicosisAutonomous tissue makes excess T3/T4 despite low TSH.
Normal BrakeWolff-Chaikoff temporarily suppresses organification.
Failed BrakeAutonomous nodules escape regulation.
Low UptakeIodine saturation can make RAIU low even while hormone synthesis is high.
Jod-BasedowIodine-induced increased synthesis.
GravesTSI positive, diffuse high uptake.
ThyroiditisDamaged cells leak preformed hormone.
INTERACTIVE
Sort The Thyroid Uptake Trap
Low uptake does not always mean the same thing. Pair it with trigger and mechanism.
Pick a chip, then place it in the correct bucket.
Jod-Basedow Fuel
Suppression / Other Thyroid Lane
BATTLE MAP
Jod-Basedow Versus The Decoys
Graves, Wolff-Chaikoff, thyroiditis, and central hyperthyroidism all share pieces. The full clue stack chooses Jod-Basedow.
Memory Hooks
Jod-Basedow: iodine is fuel for nodules.
Wolff-Chaikoff is the brake; Jod-Basedow is brake failure.
Low RAIU plus iodine load can still be synthesis-driven because the gland is saturated.
ELIMINATION GAME
Find The Fuel State
Iodine load plus nodular autonomy is not suppression. It is substrate.
Medically reviewed by Kaitlyn Cocuzzo, MD and Fatima Ali, DO · Last reviewed June 2026
Bone Wizardry is an independent educational resource for visual learning in the medical sciences. It is not affiliated with, endorsed by, or sponsored by any licensing or examination board, contains no real or recalled examination questions, and does not guarantee any educational or examination outcome.
