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I have an underactive thyroid and take 125mg thyroxine daily. The problems I have diving are that I feel the cold quicker than other divers and get tired quicker. I am euthyroid at the moment and still get these symptoms. I have just been diagnosed with very mild thyroid eye disease which only required drops to keep them moist and havent done any diving all winter so havent asked the Dr yet if it will affect my diving. My dosage took over a year to get right if you go over just reducing the dosage can take a while to have an effect on your body. It isnt an instant fix like taking a pain killer, you have to build up slowly as going over active can be bad for your heart.freediver:Any research or info on diving with hypothyroidism?