The part of a sentence "have heightened concerns" is grammatically correct and can be used in written English.
You can use this phrase when explaining that something has caused an increase in concerns or worries. Example: The recent surge in COVID-19 cases has heightened concerns among the public about the safety of returning to in-person work.
In Washington, such moves have heightened concerns, especially among lawmakers who imposed the conditions on aid.
Recent data, such as September's 9.1% rise in property prices, have heightened concerns among Chinese officials about inflation.
Attacks from abroad this spring and summer on government systems and contractors have heightened concerns over security in defense and intelligence systems.
But recent jitters in stockmarkets and commodities markets have heightened concerns that some metal prices have peaked.Even so, the mood in Toronto was celebratory.
The mortgage errors, while by themselves relatively minor, have heightened concerns within JPMorgan because they come on top of the other investigations.
Google's disclosures have heightened concerns elsewhere about Street View, which, while popular, has also prompted a backlash from privacy campaigners and some individuals.
Recent Supreme Court rulings have heightened concern about the issue, since companies can now give unlimited amounts to so-called super PACs as long as those political action committees do not coordinate directly with candidates.
These shifting priorities have heightened concern about NATO member states' defense spending, though few members are likely to meet NATO's demand that they spend two percent of their nation's GDP on defense anytime soon.
It is, of course, completely understandable that a recent toxic cocktail of falling advertising revenues, challenge to existing business models from the internet and wider cyclical issues have heightened concern about the BBC's size and scope.
