Federal health officials say asthma seems to be increasing a little, and nearly one in 12 Americans now say they have the disease.
The Centers for Disease Control and Prevention said Wednesday that 8.2 percent of Americans had asthma in a 2009 national survey of about 40,000 individuals. That's nearly 25 million people with asthma.
The rate had been holding steady at a little under 8 percent for the previous four years.
CDC officials said better diagnostic efforts could be part of the reason for the increase.
Treatment seems to be improving, with 52 percent of asthma patients in the 2009 survey saying they suffered an attack in the previous year, down from 60 percent at the beginning of the decade.
CDC report: http://www.cdc.gov/nchs