Thank you for your concern, but he was just being a boy.

Every face on the street was a potential cause for concern.

I did not want to give you any cause for concern.

The police were always a matter for concern, particularly in the early hours of the morning.

However, two points in the article are cause for concern.

Thus the people of the community clearly have reason for concern.

The true reason for her concern was a long way from that.

It'll run its course all by itself, thank you very much for your concern.

It was all true, but life had no room for such large concerns now.

"What's going on has happened before in America, and it should be no particular cause for concern to you."