I have a Doctors appointment this afternoon for my 11 DS, he has bad skin ( chicken skin on arms now spread to face, Weight gain, complaining of sore joints. I have a seriously underactive Thyroid (on 200mg) and have read that this can be hereditary and wanted to check this out. When I spoke to the doctor originally he just wanted to dismiss this. Just wondering if there is anyone who has experience of underactive Thyroid in children. In my experience GP are really bad @ diagnosing and dealing with Hypothyroidism. I may have got it all wrong but something is not right so want to get to the bottom of it.