What causes hay fever?
Hay fever is caused by an allergic reaction to pollen from trees, grasses, and weeds, which is the most common trigger. Other allergens like house dust mites, pet dander, and mould spores can also cause similar year-round reactions. A family history of allergies increases the risk, and factors such as living in polluted or damp areas can make it worse.
Key points:
- Pollen from trees, grasses, and weeds triggers most cases of hay fever.
- Indoor allergens like house dust mites and pet dander cause year-round symptoms.
- Mould spores in damp areas can provoke allergic reactions.
- Genetic factors and environments like pollution or damp homes raise the risk.
This text has been fact-checked for accuracy by medino's clinical team.