OCD and ADHD: Is there a connection?

Given this information, Dan's therapist and psychiatrist now think he may have ADHD, in addition to OCD. I don't know a lot about ADHD, but I do know that it doesn't "just appear." Throughout his schooling, before OCD made its appearance, Dan had been a teacher's dream: obedient, attentive and engaged. He excelled academically and never once were there any issues of concern. In fact, we often marveled at how he could read, or stay focused on anything, for hours at a time. It seemed obvious to me that Dan's disorganization and inability to focus were a byproduct of having to deal with OCD.

Source: http://www.mentalhelp.net/poc/view_doc.php?type=doc&id=44817&cn=6

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