According to the Allergy Center Switzerland, around 20–30% of the Swiss population suffers from a pollen allergy. In the past, the pattern was predictable: pollen arrived in spring, and by summer many people could breathe freely without worrying about hay fever. Today, this seasonal rhythm has largely disappeared — especially when it comes to managing pollen allergy symptoms with antihistamines. Milder winters and shifting seasons have significantly extended the pollen season