Facts About Asthma & Allergies

Inhalers help treat asthma by relaxing airways.

Allergies and asthma have different causes, but are often related. Asthma, an inflammation of airways, is a frequent symptom of allergies. Seventy-five percent of children with asthma also have allergies.

Causes of Allergies

Allergies are caused by an immune system that treats a harmless substance, such as pollen, as an invader.

Causes of Asthma

Asthma has many causes, including irritation of the airways due to allergies. Other causes include cigarette smoke, anxiety, cold air, pollution and acid reflux.

The Relationship

Allergic reactions produce histamine, which can cause inflammation of the airways. Allergy-induced asthma is a very common reaction.

Treating Allergies

If your asthma is caused by an allergic reaction, treating the allergy---for example, with antihistamines or allergy shots---and avoiding the allergen will help reduce asthma symptoms.

Asthma Treatments

Other treatments address asthma symptoms directly. Bronchodilator inhalers, for example, help open congested airways, but do not affect histamine levels.

References

• Allergies and Asthma: They Often Occur Together
• Tips to Remember: Asthma Triggers and Management
• Do Allergies Cause Asthma?