I was diagnosed with ADD when I was in middle school, then it was discovered that I had Graves Disease. I was told at the time that the symptoms can mimic each other. I have since had my thyroid gland ablated, and today I take synthroid and cytomel to compensate. I noticed that my difficulty with concentration didn't go away even years later once my thyroid levels were well controlled. I am now taking concerta as treatment for my difficulties with focus. I don't know if that helps any but thats my story....