Adult Diagnosis of ADHD For those who suffer from ADHD, a diagnosis can have a major impact on your life. It can help people to understand the reasons they struggle with family, work and in relationships. However it can be challenging to determine a diagnosis since symptoms can be overlapping with other conditions. A mental health healthcare professional or health professional will examine the individual and perform tests. Signs and symptoms It is possible that a person may not be aware of having ADHD until adulthood. It could be because teachers and parents failed to recognize the signs at an earlier age or because work or college demands made the disorder more apparent. Adults with adhd diagnosis uk adult who aren't diagnosed suffer in their academic, social and professional lives. Many people who are not diagnosed with adhd diagnosis uk adults suffer from a variety of problems, including relationship issues and financial difficulties.