Poor attention to detail can have various causes, ranging in severity from 'minor' to 'needs attention'. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose poor attention to detail, we could:
Are you a perfectionist, paying close attention to detail?
Possible responses:→ No, I am disorderly/imprecise and rush things
→ Average / don't know
→ Yes, I am very detail oriented, slow and careful
Not only can poor attention to detail be a sign of stress, but so can its exact opposite, being a perfectionist.