Hay fever is caused by an allergic reaction to pollen.
Hay fever affects 10-15% of children and around 25% of adults in the UK
How long your hay fever lasts will depend on what the causative allergen is.
Symptoms of hay fever include:
If you have asthma, you might also:
Hay fever will last for weeks or months, unlike a cold, which usually goes away after 1 to 2 weeks.
Hay fever treatments include: