Asthma (AZZ-muh) is a disease of the breathing tubes that carry air to the lungs. The linings of the tubes swell, and they fill up with mucus (MYOO-kus). This is called inflammation (in-fluh-MAY-shun). It makes the tubes get narrow. This makes it hard to breathe.
Read More![](/storage/app/media/clouds/crab.png)
![](https://cdcssl.ibsrv.net/ibimg/smb/300x300_80/webmgr/1n/d/d/pdf/loc.png.webp?439170148fe83017a43b424ee57623d9)