Thyroid resides as in the center of the 5th chakra. The 5th chakra is considered the center for creative expression. It may get stuck due to a past [childhood] trauma. Iodine may help the body release the repressed emotions that are psychologically preventing one from creatively expressing ones inner-most feelings. This release may also be accompanied by remembering [or re-experiencing] that particular event, perhaps this may be played out again in dream state.