Asthma is a chronic disease characterized by recurrent attacks of breathlessness and wheezing. The airways become inflamed and are lined with excessive amounts of mucus. This inflammation causes the airways to narrow periodically and this, in turn, produces wheezing and breathlessness.

The causes of asthma are not completely understood. However, risk factors for developing asthma include inhaling asthma “triggers”, such as allergens, tobacco smoke and chemical irritants.

Asthma affects people of all ages, but it most often starts in childhood. Asthma can't be cured. The most effective treatment for asthma is identifying triggers, such as pets or aspirin, and limiting or eliminating exposure to them. If trigger avoidance is insufficient, medical treatment is available. Desensitization is currently the only known "cure" to the disease. Other forms of treatment include relief medication, prevention medication, long-acting B2-agonists, and emergency treatment.

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