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- Asthma | Asthma Symptoms | Asthma Attack - MedlinePlus
The exact cause of asthma is unknown Genetics and your environment likely play a role in who gets asthma An asthma attack can happen when you are exposed to an asthma trigger An asthma trigger is something that can set off or worsen your asthma symptoms Different triggers can cause different types of asthma: Allergic asthma is caused by
- Asthma: MedlinePlus Medical Encyclopedia
Asthma is a chronic disease that causes the airways of the lungs to swell and narrow It leads to breathing difficulty such as wheezing, shortness of breath, chest tightness, and coughing Asthma: MedlinePlus Medical Encyclopedia
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