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Definition: Triggers

Definition: Triggers


An asthma trigger is anything that brings on coughing, wheezing, trouble breathing, and other symptoms in a person with asthma. Some common triggers include colds, smoke, cold air, exercise, and certain things that cause allergic reactions, such as dust mites or pollen. Triggers can vary from person to person and from season to season. They also can change as a person grows older.