First Aid Allergies and Anaphylaxis How to Treat an Allergic Reaction Share Pin Email More in First Aid Allergies and Anaphylaxis Basics Symptoms Bites and Stings Orthopedic Emergencies Soft Tissue Injuries Breathing Emergencies Emergency Preparedness First Aid at Home Infections Calling for Help Heat and Cold Exposure Pediatric Emergencies Glossary View All Updated April 22, 2016 An allergic reaction is your immune system responding to something it considers poison. Here's what to look for, and how to treat it. Up Next Up Next Article Could You Be Allergic to Your Hair Dye? Up Next Article Is Zyrtec the Right Medication to Treat Your Allergies? Up Next Article What Should You Know About Allergic Reactions to Rituxan? Up Next Article What Constitutes an Actual Allergic Reaction?