For Thyroid Cancer patients undergoing a Low Iodine Diet (LID), finding non-iodized salt in some regions of India, especially Kerala can be a pain. The Kerala government has imposed a state-wide ban on selling non-iodized salt.
Those who require non-iodized salt can buy "induppu" from any ration shop or place where you buy whole sale dals, grams, rice etc. If you do not get induppu, crystal salt can also be bought. This does not contain iodine as well.