By Amy NortonHealthDay Reporter
TUESDAY, Jan. 17, 2017 (HealthDay News) -- Many adults who've been diagnosed with asthma may not actually have the respiratory disease, a new study suggests.
Researchers in Canada said that of more than 600 adults diagnosed with asthma, one-third did not have the disease based on objective tests.
Eighty percent of those people had been taking asthma drugs. That included 35 percent who were taking medication every day, the investigators found.
Respiratory experts said the findings are worrying, considering the cost and side effects of asthma drugs.
And it's not completely clear why so many patients with an asthma diagnosis did not really have the disease.
There were some cases where people obviously had asthma when they were diagnosed, said lead researcher Dr. Shawn Aaron, a respiratory specialist at Ottawa Hospital, in Canada. But their symptoms later went into remission.
In most cases, though, it could not be determined whether the patient's asthma had ...