My thyroid was found to be overactive about 18 months ago and since then I've been having blood tests every 3 months. Sometimes it shows as normal and other times it's high again. The strange thing is that I have no symptoms of an overactive thyroid and actually have some symptoms of it being underactive ie: feeling really cold all the time, constipation.

My doctor gave me tablets to treat it but they gave me awful side effects and I stopped. I then paid to see a private specialist and he advised that there was nothing to worry about unless I start having any symptoms. So I've never taken anything for it. I am really confused as to how it can be overactive but without any signs of it at all. My doctor also seems mystified about it.