The phrase "main cause of concern" is correct and can be used in written English.
You can use it to describe something that worries you or the cause of a problem. For example, "The main cause of concern for the government is the rising unemployment rate."
For health experts, the main cause of concern is not the prevarication itself but something perhaps more serious.
Kurt Tippet's demolition job on Nathan Brown was the main cause of concern for the Pies but their charge is finally gathering pace.
Even with Greece the main cause of concern, investors are keeping a wary eye on Spain, which is struggling to clear the bad loans in its banking sector after the collapse of the credit bubble.
Even with Greece the main cause of concern in Europe, investors are keeping a wary eye on Spain, which is struggling to clear the bad loans in its banking sector after the collapse of the credit bubble.
The main cause of concern in this regard is the bone length, stature and body mass estimates for the fossil hominins that we obtained from the literature.
The risk of breast cancer in this cohort of women appears to be the main cause of concern about taking HRT.
This failure is more prominent for higher breakdown rated devices (above 2 kV) and represents one of the main causes of concern, especially if the power systems are operated at higher altitude.
While the risk posed by M. bovis to human health is low in most developed countries, the main causes of concern related to M. bovis in industrialized countries are epizootics in domesticated and wild mammal populations [2].
Cardinal Sin said on July 30th that he was particularly upset that cronies of the Marcos era, "the past plunderers of our nation", again had access to the presidential palace.Mr Estrada's friends, rather than the president himself, may be the main cause of his critics' concern.
Although UV radiation is considered as the main cause of malignant melanoma concerning the sun-exposed body sites [ 8, 9], it seems that other mechanisms are also capable of initiating melanocyte malignant transformation, leading to tumours with different clinical behaviour.
This is the main cause of our fear.
