"causing serious concern" is correct and usable in written English.
This phrase is used to describe something that is worrying or troubling to a significant degree. Example: The recent increase in air pollution is causing serious concern among residents of the city. In this sentence, "causing serious concern" is used to show that the level of air pollution has reached a point that is causing worry and alarm among the city's residents.
"Teachers will complain about practically anything, but I can't remember the windows ever causing serious concern".
Patrick Mercer, the Conservative homeland security spokesman, said he was told by Greater Manchester police there was now a persistent pattern of such suspects causing serious concern.
"We sincerely apologise for causing serious concern to students and their parents," said Tatsuya Mizogami, the university's president, according to Kyodo.
The rebel gains may be causing serious concern in the west, but backstage, after the show, the band explained that, as Tuareg people, they regarded this as "a dream come true".
The figures have emerged as a group of cross-party MPs and peers hope to persuade the government to reconsider its determination to leave the European Union's customs union – a move causing serious concern among manufacturing groups.
Another diplomat pointed out that Moslem fundamentalists and leftists opposed to Egypt's ties to the United States and Israel had become even more vocal in recent months, causing serious concern for the Government.
China is "creating a great wall of sand" through land reclamation in the South China Sea, causing serious concerns about its territorial intentions, the commander of the US Pacific fleet said on Tuesday.
There are 1,466 glacial lakes in Nepal, with 21 big enough to cause serious concern.
The activities of the cult, he said, had caused serious concern in Australia.
The Foreign Ministry in Moscow issued a statement saying the missile firing "causes serious concern".
The mosquito-borne virus that has spread across many countries in South and Central America has caused serious concern in Brazil.
