Because they change with the seasons, are often called . An is a sensitivity of your to something that is ordinarily harmless. are caused by an overreaction of the immune system to certain allergens found outside, like those from spores and tree, grass or weed pollens.
While seasonal allergens can be difficult to avoid because it seems like they’re everywhere, there are things you can do to help minimize your exposure to them.
Select an allergy to learn more: