What is iodine related hypothyroidism?

Both deficiency or excess could cause it. Iodine deficiency (most common cause of hypothyroid and goiter worldwide, iodince intake <100micg/day, 2 billion people) Iodine Excess (inhibits iodide organification and T4 T3 synthesis (Wolff-Chaikoff Effect), normal people escape this condition, but people w/abnormal thyroid don't and become hypothyroid w/in days