People with seasonal allergic rhinitis (hay fever) experience symptoms during the time of year when certain allergens are in the air outdoors. There are several allergy seasons: springtime, when plants bloom and tree pollen counts soar; summer, the season for grass and weed pollen allergies; and autumn, the time for ragweed and mold allergies. Perennial allergies, or year-round allergies, are typically caused by indoor allergies to dust mites, mold, cockroaches and pet dander.
Anaphylaxis is a medical emergency that requires immediate attention. Learn what to do if you develop anaphylaxis and how you can help prevent this potentially life-threatening allergic reaction.