Asthma

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Asthma	Asthmatic bronchiole and normal bronchiole	Common asthma triggers	Exercise-induced asthma
Lungs	Metered dose inhaler use - series	Nebulizer use - series	Normal versus asthmatic bronchiole
Peak flow meter	Peak flow meter use - series	Respiratory system	Spacer use - series
Spirometry

Asthma is an inflammatory disorder of the airways, which causes attacks of wheezing, shortness of breath, chest tightness, and coughing.

See also: Pediatric asthma

Bronchial asthma; Exercise-induced asthma

Asthma is caused by inflammation in the airways. When an asthma attack occurs, the muscles surrounding the airways become tight and the lining of the air passages swell. This reduces the amount of air that can pass by, and can lead to wheezing sounds.

Most people with asthma have wheezing attacks separated by symptom-free periods. Some patients have long-term shortness of breath with episodes of increased shortness of breath. In others, a cough may be the main symptom. Asthma attacks can last minutes to days and can become dangerous if the airflow becomes severely restricted.

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In sensitive individuals, asthma symptoms can be triggered by breathing in allergy-causing substances (called allergens or triggers).

Common asthma triggers include:

• Animals (pet hair or dander)
• Dust
• Changes in weather (most often cold weather)
• Chemicals in the air or in food
• Exercise
• Mold
• Pollen
• Respiratory infections, such as the common cold
• Strong emotions (stress)
• Tobacco smoke

Aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs) provoke asthma in some patients.

Many people with asthma have an individual or family history of allergies, such as hay fever (allergic rhinitis) or eczema. Others have no history of allergies.

Review Date: 05/21/2009
Reviewed By: Allen J. Blaivas, DO, Division of Pulmonary and Critical Care, UMDNJ-New Jersey Medical School, Newark, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.