For many city-dwelling teens with asthma, their chronic lung disease may go undiagnosed and untreated, a new study finds.

According to a survey of more than 33,000 New York City high school students, 20 percent reported having asthma-like symptoms, but were not diagnosed with the illness.

The researchers also found that teenage girls and Asian-Americans were more likely to have undiagnosed asthma.

“Potentially, there are a lot of these kids out there who are undiagnosed,” said lead researcher Sharon Kingston. She is an associate professor of psychology at Dickinson College in Carlisle, Pa.

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