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Re:Air Pollution Seems to Cause Dementia by jtuente on Friday May 10, 2019 @04:06PM (#19881719)
http://www.thyroid.org/iodine-deficiency/

This page indicates hypothyroidism is a result of iodine deficiency, rather than excess. Hyperthyroidism may be caused by excess iodine.

Re:Air Pollution Seems to Cause Dementia by SketchySeaBeast on Friday May 10, 2019 @04:11PM (#19881759)
https://articles.mercola.com/sites/articles/archive/2012/02/...

It can be both. Also, too much iodine can cause thyroid inflammation and cancer.

https://ods.od.nih.gov/factsheets/Iodine-Consumer/