Adults With Attention Deficit Hyperactivity Disorder (ADHD) As Adults, individuals have many responsibilities and roles which require focus, attention and organization. Undiagnosed ADHD can cause a person to handle certain tasks. This can impact their life, and lead to feelings of self-worth and confidence problems. In the UK, the NICE https://www.iampsychiatry.uk/adult-adhd-assessments-and-treatments/