Seasonal Allergies Assessment View Calculator Spring allergies are the most common as trees, flowers, and weeds grow and pollenating bees are busy. Fall is the second common allergy season, with different plants blooming and molds are more active. People who are allergic to the spring and fall pollens also tend to be sensitive to indoor irritants like dust mites, animal dander, and molds, often leading to year-round allergy symptoms. Take this quick assessment to learn the signs of seasonal allergies and help you determine if you or your child suffers from seasonal allergies. Learn more about putting this calculator or other calculators on your website.