Seasonal hayfever, which occurs at specific times of year
Perennial hayfever, which can happen all year round
You may even have both types in which case you could be suffering all year round, though worse in the spring.
Out of the two, seasonal hayfever is the more common affecting 1 in 5 New Zealanders. It occurs in the spring, the summer months and autumn depending on what plant or pollen you are allergic to. The problems can be caused by the pollen of certain trees in spring, grasses in spring and summer, and weeds in autumn.
Perennial or ‘year round allergic rhinitis’ can happen at any time as it’s usually caused by allergens in the house such as dust mites, mould and animal dander (loose, flaky skin).