Hay fever is a common allergic reaction which occurs at particular times of the year. It is known as seasonal rhinitis, sharing symptoms with perennial (year round) allergic rhinitis, but occurring as a reaction to pollen from grass, trees and weeds during the early spring and summer months. It can affect both adults and children.
Hay fever is usually worse between late March and September, especially when it’s warm, humid and windy. This is when the pollen count is at its highest.