Abstract
Workers with mental health disorder have been increasing in numbers. Social factors such as developing information technologies and individual factors such as philosophy are inferred to be the background of the phenomenon. Among youth in the occupational field, mental health disorders such as depression or adjustment disorder are found. Doctors are requested to treat them not only with drug therapy but with consideration of growing environment and working situation. On the other hand, the occupational health staff treat such youth with mental health disorders not from the aspect of Illness but from Caseness (the fact that workers cannot work continuously as usual). Doctors should know that judgements in occupational field differ from those in medical field, and cooperate with the occupational staff considering national guide lines and road maps which are response standards in occupational fields.
