Seasonal Allergies
An allergy (allergic rhinitis) that occurs in a particular season is more commonly known as hay fever. Hay fever occurs when your immune system overreacts to an outdoor allergen, such as pollen. An allergen is something that triggers an allergic response. The most common allergens are pollens from wind-pollenated plants, such as trees, grasses, and weeds. The pollens from insect-pollinated plants are too heavy to remain airborne for long, and they’re less likely to trigger an allergic reaction.

Hay fever comes by its name from hay-cutting season. Historically, this activity occurred in the summer months, around the same time many people experienced symptoms.

Seasonal allergies are less common during the winter, but it’s possible to experience allergic rhinitis year-round. Different plants emit their respective pollens at different times of year. Depending on your allergy triggers and where you live, you may experience hay fever in more than one season. You may also react to indoor allergens, such as mold or pet dander.