The phrase "as a main problem" is correct and usable in written English.
It can be used when identifying or emphasizing a significant issue or challenge in a discussion or analysis.
Example: "The lack of funding is identified as a main problem affecting the project's success."
Alternatives: "as a primary issue" or "as a key challenge".
Critics cite voter confusion as a main problem.
In keeping with global trends, a shortage in the nursing workforce in PHC was identified as a main problem in the current study.
A qualitative study conducted in the region in 2000 showed that physical IPV was perceived as a main problem by women, closely linked to men's alcohol abuse and psychological violence.
6 8–10 In a study of 11 patients treated for single ventricle physiology, the patients emphasised the limitations in their physical and social activities as a main problem.
Interestingly, lack of time could not be revealed: most GPs stated to take as much time as possible and patients did not regard time limitation as a main problem or at least showed understanding for the limitation in the face of overcrowded waiting rooms.
However, this is not a main problem as it appeared from the power study that the A × E effect is not associated with false positives.
In addition, unsuccessful differentiation is also a main problem as we often get immature cells; clear examples are hematopoietic stem cells or endoderm (β cells or liver cells).
Arcing appears as a main safety problem when air gaps are present between electrodes.
Chile is facing an advanced epidemiological transition process with non communicable diseases (NCD) as a main health problem by 2010.
Land degradation is recognized as a main environmental problem that adversely depletes soil organic carbon (SOC) and nitrogen (SON) stocks, which in turn directly affects soils, their fertility, productivity and overall quality.
As a main difficult problem encountered in electrochemical machining (ECM), the cathode design is tackled, at present, with various numerical analysis methods such as finite difference, finite element and boundary element methods.
