If breathing in fresh spring air makes you sneeze, or sitting on a grassy hill gives you a rash, you may have a grass pollen allergy. Grass pollen is microscopic and travels easily through the air. Everyone breathes in grass pollen, but not everyone reacts to it. If you have a grass allergy and go outside on a day when pollen is in the air, you’re likely to be irritated by symptoms like watery eyes or a runny nose. Some people can also have a reaction just by touching the grass. If you’re severely allergic, you could even experience anaphylaxis.
Grass pollen, like tree and weed pollen, can travel far on windy days, so your reactions may not be because of the grass growing in your yard or neighborhood. The source of your allergies could actually come from grass miles away.