Does anyone know if AAS have an effect on the thyroid? I had blood work done and was told by my doc that I have an over active thryoid, needless to say I had a scan done and my thyroid is enlarged. At this point I am not sure if I should disclose that I have used steroids for some time now. It sucks when your blood work comes back and a few things are out of wack and your doc is wondering what is going on and you know why things are messed up.