"Asthma is a chronic lung disease characterized by recurrent and intermittent episodes or attacks in which the linings of the airways swell, mucus blo...
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC)
cannot attest to the accuracy of a non-federal website.
Linking to a non-federal Website does not constitute an
endorsement by CDC or any of its employees of the sponsors
or the information and products presented on the website.
You will be subject to the destination website's privacy
policy when you follow the link.
CDC is not responsible for Section 508 compliance
(accessibility) on other federal or private websites.
For more information on CDC's web notification policies, see Website Disclaimers.