Allergy News
Search for Allergies
Health Topics: Allergies
What are allergies?
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.

About Dr. James Li
advertisement
MSN Health & Fitness does not provide medical or any other health care advice, diagnosis or treatment.







