That is, just because a person is allergic to one tree species does not mean he or she will be allergic to another. However, if you are allergic to a tree in a certain family of trees, it is possible that you may be allergic to other trees in the same family. Trees pollinate from February through April, with some of the worst allergic reactions for people occurring in early spring. Grasses begin pollination in the late spring, and in some areas do not stop until summer ends. Those allergic to tree and grass pollen can lessen the severity of their reactions by determining the circumstances under which they react and then trying to avoid those circumstances.
Pollen allergies can cause a condition called seasonal allergic conjunctivitis.
About 15 million Americans have this condition. As with other pollen allergies, trees, grass, and ragweed are major culprits. Symptoms include redness, itching, tearing, burning, and swelling of the eyes. If symptoms are not treated, they may progressively worsen. The amount of pollen in the air is usually higher in the country than in the city.