There is no exact number, but it is estimated that up to 50% of adults with ADHD may not be diagnosed or treated. Many adults with ADHD go undiagnosed because they did not exhibit symptoms in childhood or were never diagnosed during childhood. Others may have been diagnosed as children but never received the proper treatment or follow-up care. It’s important for adults who suspect they may have ADHD to seek a diagnosis and treatment from a qualified healthcare provider. It may be more difficult to find providers comfortable in treating adults with ADHD. Access to care can be a barrier. Some people may feel there is a stigma associated with the diagnosis. ADHD can make it more difficult to stay organized and make the scheduling and appointments to get evaluated. If you or someone you know has symptoms, seek evaluation by a provider comfortable in treating adults with ADHD.