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Asthma

Asthma is a disease of the human respiratory system in which the airways narrow, often in response to a "trigger" such as exposure to an allergen, cold air, exercise, or emotional stress.

This narrowing causes symptoms such as wheezing, shortness of breath, chest tightness, and coughing, which are the hallmarks of asthma.

Note:   The above text is excerpted from the Wikipedia article "Asthma", which has been released under the GNU Free Documentation License.
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July 31, 2015

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