Allergy triggers, like oak, ash, alder, elm, poplar, sycamore, grasses, molds, mulberry, and ragweed, can cause anything from sneezing to watery eyes to fever.

Experts estimate that 20 percent of Americans suffer from allergies. And that number is even higher in certain regions of the country. For example, almost half of the population in the Southwest fights the allergy battle every year.

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