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Asthma: Symptoms, Allergens
In Greek, asthma literally means 'difficulty breathing.'
Asthma is characterized by inflammation of the lining of the airways of the lungs. The effect of this inflammation is that it causes the narrowing of airways, which reduces the amount of air that can be blown out of the lungs, and the rate at which air can be expelled form the lungs. In addition to this, inflammation causes airways to be hypersensitive to many irritants such as cold air, pollution fumes, aerosols and strong scents. These can trigger the constriction of the irritated airways, giving rise to asthma.
Nerve impulses slow the heart rate and the activity of intestines when the body shuts down during sleep, but at the same time causes minor narrowing in the bronchi. The influence is inflated in people with asthma, making their symptoms and lung function worse at night.
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