why do you get water in your eyes when you have hay fever? and how do you get hay fever

Question: why do you get water in your eyes when you have hay fever? and how do you get hay fever
- Keywords:
  eye,
  hay fever,
  reason,
  tear
Asked by to Emma on 20 Jun 2014. This question was also asked by .
- Emma Reid answered on 20 Jun 2014:
  
  Hi there!
  Hay fever is really common with up to 25% of people suffering from it every year! It happens when the immune system becomes sensitized to things like pollen, dust or animal hair and an allergic reaction is triggered. Things that trigger an allergic response are called allergens and there’s lots of them out there! The allergic response involves the release of histamine, which causes itchy, watery eyes and sneezing. The lining of our nasal passages swell up too and we produce more mucus. All these things form part of our body’s defence mechanism against something it believes to be harmful, i.e. pollen, and act to ‘flush out’ the allergen to protect us. Hope this answers your question! 🙂
  Emma

Question: why do you get water in your eyes when you have hay fever? and how do you get hay fever