With a bit of planning, effort and common sense, many people can boundary their suffering or perhaps even avoid it altogether, according to Dr. Mark Dykewicz, professor of inside medicine and chief of allergy and clinical immunology at the Saint Louis University School of Medicine.

For the most part, seasonal allergies are caused by airborne pollens -- very fine powder released by trees, grasses and weeds as they pollinate and fertilize other plants of the same kind. Molds in outdoor air can also contribute to seasonal allergies. Although outdoor allergens can be present year-round in warmer climates, allergy season generally begins in late winter or early coil and runs through late summer or early fall.