What is Concern ?
Concern is (noun) 1. worry She’s a cause of great concern to her family. 2. interest My main concern is to ensure that we all enjoy ourselves. The teachers showed no concern at all for the children’s safety. it is not someone’s concern it’s nothing to do with someone I don’t care what they do with the money – it’s not my concern. 3. a company or business a big German chemical concern(verb) 1. to have a particular thing as a subject the letter concerns you the letter is about you that does not concern him it has nothing to do with him as far as something is concerned used for introducing the subject of a comment to concern yourself with to deal with You needn’t concern yourself with cleaning the shop. 2. to make someone worry It concerns me that he is always late for work.
source: Easier English, Student Dictionary Upper Intermediate Level