How is iodine bad for human health?

Iodine is needed by your thyroid gland to produce thyroid hormones. However, exposure to unnecessarily high

levels of non-radioactive and radioactive iodine can damage

the thyroid. Damage to the thyroid gland can result in effects in other parts of your body, such as your skin, lung,

and reproductive organs.

It is bad I'm general bc iodine is not made up of human needings