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Adult ADHD Symptom Checklist Research suggests that the symptoms of ADHD can persist into adulthood, having a significant impact on the relationships, careers, and even the personal safety of individuals who may suffer from it. Because ADHD is often misunderstood, many people who have it do not get appropriate treatment and, as a result, may never reach their full potential. Part of the problem is that it can be difficult to diagnose, particularly in adults.