Statistics show that as many as 30 percent of adults in the United States (and also probably at least as many children) suffer from seasonal allergies. Seasonal allergies are set off by the increase of pollen (mostly, but also dust and weeds) in the air, when the weather shifts. The most dramatic of these seasons, of course, is Spring, when plants are wakening from the winter sleep and insects and trade winds spread pollen through the air.
The increase in air pollen content causes seasonal allergy sufferers to have allergic rhinitis: inflammation of the sinus cavity. But that is just the beginning. Seasonal allergies can result in runny noses and sneezes as well as nasal congestion and red, itchy eyes.