This reply was originally posted by user ADHDmomma in ADDitude’s now-retired community.
ADHD is a diagnosis of degree. Everyone has some symptoms of ADHD sometimes, but they must have many of the symptoms at once and to the severity that it impairs function: https://www.additudemag.com/adhd/article/1041.html.
The other key piece is the willingness of the patient to consider it and accept it. All your knowledge about ADHD and your suspicions won’t do any good if he isn’t willing to consider the possibility of ADHD, which it sounds like he’s not. Your insistence that he consider it when he’s quite opposed to the possibility can actually just make things worse.
ADDconnect Moderator, Author on Parenting ADHD, Mom to teen boy with ADHD, LDs, and autism