An allergic reaction is an overreaction of the immune system to a substance called an allergen. Allergens include chemicals, foods, medicines, mold, plants, and pollen.
Symptoms of an allergic reaction can range from mild and annoying to severe and life-threatening.
Allergic reactions may not occur the first time a person is exposed to an allergen. A person may become more sensitive to the allergen with each exposure.
Current as of: October 6, 2019
William H. Blahd Jr. MD, FACEP - Emergency Medicine & Adam Husney MD - Family Medicine & Martin J. Gabica MD - Family Medicine & H. Michael O'Connor MD - Emergency Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2020 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Find our contact forms and phone numbers or give feedback on a recent experience using Care to Share.
View test results, schedule appointments, or request prescription refills from the convenience of your computer or mobile device.
Learn about health system news and meet new providers in Progress Notes, Lancaster General Health's provider newsletter.