Don't you just love Spring? Blooming flowers, singing birds, and a general 'happy feeling' in the air. Unless you have hay fever of course, in which case you're probably dreading venturing to your local nature-spot. Picnic in the park? No thanks! Hay fever is one of the most common allergies in the world, affecting an estimated 30-40% of the world's population. For some, hay fever causes a running nose, itchy eyes and general discomfort. For others, hayfever is a major risk factor, worsening conditions such as asthma and other chronic upper-airway diseases.