What Causes Springtime Allergies?
Spring allergies are a result of pollen from trees, which can start pollinating anytime from January to April, depending on the climate and location. Trees that are known to cause severe allergies include oak, olive, elm, birch, ash, hickory, poplar, sycamore, maple, cypress, and walnut. In some areas of the world, some weeds will also pollinate in the springtime.
