Hi Folks, My doctors discovered that my thyroid had failed just 4 months out from radiation. It explained why I seemed to be taking so long to recover. It has been easily fixed - I now take synthetic thyroxine every day. It is unusual for this to happen so quickly, it is possibe that I was mildly hypothyroidic beforehand even though I hadn't noticed symptoms. Has anyone who has suffered from hypothyroidism regained any thyroid function over time? I gather this is a possibility. Thanks if you can help. Helen