concerned about something—(also: concerned at something) caring about what happens to smth.; worrying about smth.:
- The United Kingdom is deeply concerned about its “brain drain.”
concerned with something—
1. actively involved with smth.; engaged in smth.:
- The organization was chiefly concerned with educating Jewish immigrants.
2. having to do with smth.; related to smth.:
- His work is concerned with the preparation of documents for export.