If after five years of treatment for depression my lack of concentration persists over and over again. Could it be adhd?
Lack of concentratio. Further evaluation to confirm/rule out the cause can warrant further interventions.
Anything is possible. Having one problem doesn't mean you can't have another. Why not talk with your doctor about that possibility?
YES IT COULD BE. Plenty of good treatments, but you need seen.
Could be processing . Lack of focus can be from learning or processing problems. Medications will not fix those.