Why Is Asthma More Common Now?

According to the National Heart Lung and Blood Institute, asthma is a chronic lung disease affecting more than 22 million Americans. Researchers believe a variety of present-day factors interact and cause asthma to develop.

Defintion

• Asthma is characterized by spasms of the large airway tubes of the lung, which causes the swelling of the airway linings, resulting in the production of thick mucous.

"Hygiene Hypothesis"

• Researchers believe the Western lifestyle is responsible for what they call the "Hygiene Hypothesis"--making asthma more common now. The emphasis on hygiene and sanitation does not expose young children to infections which affects the way the immune system develops.

Allergens

• Allergens in today's environment are a cause of asthma attacks. These allergens include pet dander, pollen, dust mites and irritants like tobacco smoke.

Acid Reflux

• A Western diet can cause acid reflux which, in turn, can bring on asthma. When acid gets into the esophagus, it can then be inhaled into the lungs and cause irritation.

Occupational

• Exposure to industrial dusts and chemical irritants can cause asthma to develop at the workplace; this is known as occupational asthma.