Hayfever is a common allergic condition that affects up to one in five people.
It usually affects people in the spring and summer when plants start to release pollen, a fine powder let out by plants as part of their reproductive cycle.
The proteins in pollen can cause your nose, throat, eyes and sinuses to become swollen and inflamed.
The main three types of pollen that can trigger allergic reactions are tree pollen, grass pollen and weed pollen.