No, Iodine is not only present in salt. It is present in other foods like
>

iodine difficiency causes thyroid problem. if people who eat only maggiganam without veggies or fruits they have less iodine and thyroid problem.

Thyroid problem is not due to only iodine problem only. It could be due to lot of other reasons

Unless you eat only maggiganam then you dont need iodized salt

Special hill side living people who use only hill food. Hill food dont have iodine.
If we live in hyderabad all the foods we get are from different souces and contain iodine.

natural raw foods have natural iodine that is enough for body. We dont need to add iodized salt additionally

Na or sodium is needed in very small quantity for body. We dont need additional salt or Nacl (sodium chloride).

Except rain water every other food has sodium in right quantity Just like mother milk has all nutrients in right quantity need for the infant or baby

totakura or glass of milk or spinach or tomato or veg juice all have some sodium or salt in it.

What

we dont need any salt or saindrava lavanam etc