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From all that I have learned about ADHD, I do not recall seeing stubbornness as a symptom of ADHD. Sometimes oppositional defiance disorder (ODD) can appear with ADHD and the main symptom of ODD is stubbornness.
I am not sure if this is the information you are looking for. Could you tell us a little more about why you asked this question, is this about you or your child (or another child you know)? If so, what types of problems are you having or seeing?
Let me know and I will try to find some additional information to help you.
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