How to Diagnose Adhd Misdiagnosis in Adults Many adults seek an assessment because they are dissatisfied with the symptoms of ADHD. They could lose their jobs due in part to missed deadlines, or struggling with relationships because of impulsive behaviors or having financial trouble because they forget to pay their bills or forget to track purchases. Ask your health care provider or a mental health professional about their education and experience in diagnosing ADHD in adults. ...