I was just reading about the balance of endocrine hormones in a book about arthritis, and how for some people if one of the endocrine organs gets all the attention with supplementing hormones then it could cause big strains on the other organs. This is because of the support role each organ gives to others (the balance). Iodine is also a DETOXIFIER so that I believe you must go slow at first and build up iodine in your system. Iodine is a support element in your system and to have a reaction to it means something deeper is going on. Also using salt (natural sea salt) is very beneficial while taking iodine because of it's ability to slowly detox bromines (very bad for the body) and restore fluid stores in the body. Many times people who have problems with minerals, vitamins and elements can not assimilate them (digest) and this is a huge problem. By not digesting these helpful nutrients they become a negative load on the body and you can become intolerant of them thus bad reactions and symptoms. If this is a problem then and excellent treatment is NAET or BIOSET. You can look up either of these things on the web. I have had bioset done and it works very well. It allows the body to reset it's self to absorb and cope with outside influences (allergies, food, ect.)