What is hay fever?Hay fever is an allergic reaction to pollen. There are around 30 different types of pollen that can cause hay fever, but the two types that affect the most people in the UK are Timothy-grass and Ryegrass pollen. Around 90% of people in the UK with hay fever are allergic to them. It isn’t only grass pollen that can cause hay fever symptoms to flare up. Tree and weed pollen can too, and 25% of hay fever sufferers are allergic to tree pollen, while a weed pollen allergy is much less common.
Different pollen types are prevalent at different times of yearHay fever can affect you at different times of the year, depending on what you’re allergic to:
- Mid-May to July (grass pollen)
- Late March to mid-may (tree pollen)
- Late June to September (weed pollen)