Allergies

Allergies occur when the immune system reacts to a foreign substance that is typically harmless. Common allergens include pollen, pet dander, dust mites, certain foods, and insect stings.

50 million Americans
Severity: Mild
Chronic Condition
Not Contagious
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Table of Contents

At a Glance

What is it?
Allergies occur when the immune system reacts to a foreign substance that is typically harmless. Common allergens include pollen, pet dander, dust mit
Who it affects
All ages

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For informational purposes only. Always consult a healthcare professional.

Sources & References

  1. Mayo Clinic — mayoclinic.org
  2. National Institutes of Health (NIH) — nih.gov
  3. Centers for Disease Control and Prevention (CDC) — cdc.gov
  4. MedlinePlus — medlineplus.gov
  5. World Health Organization (WHO) — who.int
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