Adults With Attention Deficit Hyperactivity Disorder (ADHD) As Adults, individuals have many responsibilities and roles which require focus, attention and organization. Undiagnosed ADHD may make it difficult for people to handle certain tasks. This can affect their lives and cause low self-esteem and confidence issues. In the UK, the NICE https://www.iampsychiatry.uk/adult-adhd-assessments-and-treatments/