Symptoms of ADHD in adults trend around two main themes: hyperactivity & impulsive behavior as well as inattention and lack of focus. While separately these behaviors are typical for an adult to experience at various stages in their life, if they are occurring frequently and together, it is a sign there may be a problem.
Adults diagnosed with ADHD are up to 2-3 times more likely to go through a divorce, bankruptcy, drop out of school, abuse substances, have car accidents, and more. More statistics can be found on CHAAD.org.
A proper clinical evaluation can determine if your symptoms are in fact caused by ADHD and not another concern. A full evaluation does include screening questions but also more involved tests as well as interviews with you and family members.