Many people with ADHD go a long, long time without being diagnosed. Sometimes they never get diagnosed. Commonly, this is because they simply don’t know the symptoms of ADHD and no one else recognizes that they have signs of ADHD either, so they live on in not-so-blissful ignorance...Other times, though, people do have an inkling that they might have ADHD, but they don’t seek professional psychological help. Why does this happen? I can think of a few possible reasons.