The clearest way to know if you have adult ADD is through a formal neuropsychological evaluation conducted by a licensed clinician. Signs that may prompt you to seek an evaluation include long-standing difficulty staying focused, repeated relationship or work problems related to forgetfulness or inattentiveness, and a sense that you have always had to work harder than others to stay organized. Self-recognition of these patterns is a starting point, but only a professional assessment can provide a reliable diagnosis.