Be concerned with & be concerned about

Be concerned with = have an association

Be concerned about = have reservations, be interested in

I would like to know the difference between these two phrases, thanks in advance.

"concerned with" means "relating to", "involved with":

This report is concerned with technical details.

"concerned by" (or "concerned about") means "worried by", "troubled by":

I'm concerned by the increase in traffic accidents.

Thanks for your reply, Mr. Wordy. Your explanation is very clear, but, I've found many examples (by google search) which seem to me that both of these two phrases can be used in the same meaning of "worried by", "troubled by".

Here are just serveral examples excerpted from google search:

Should I be concern

Sometimes the first one is used in the negative to mean "mind your own business."
"You don't need to be concerned with that." (It's closer to the "about" meaning.)

- A.

xczzhh
Should I be concerned with my weight??
Why should people be concerned with the current rates of plant and animal extinction?

Should I be concerned about my ovarian cyst?
Should a adult male be concerned about excess iron intake?

Any comment?

Thanks, Mr. Wordy. Now I understand it.

Thanks to you all.

xczzhh I would like to know if there's any difference between these two phrases, thanks in advance!