English is the most common language within the USA. According to the USA census, "[Based on] the 2019 data, 52% of people who spoke Chinese and 57% of those who spoke Vietnamese at home in the United States spoke English 'less than very well,' compared to the other three common languages: Spanish 39%, Tagalog 30%, and Arabic 35%.".

Studies show that individuals with limited English proficiency are less likely to have a stable source of healthcare and are more likely to rely on emergency departments for care. This becomes associated with lower rates of health insurance coverage, reduced access to preventive services such as vaccinations and screenings and higher rates of chronic conditions due to delayed care.