An allergy occurs when a person's immune system reacts to allergens (to which it is sensitive), which are substances in the environment that do not cause problems for most people. People with asthma experience a narrowing of the airways in the lungs, obstructing the flow of air in and out of the lungs. This narrowing can be reversed with medication, and therefore people with asthma can lead a normal, active life if they take preventive medications regularly. 9910000561
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