The most common culprit of all our allergies is pollen. Pollen is light and is very easily picked up by wind. Seed bearing plants like evergreens and some flower bearing plants are allergens. In order to be considered an allergen, a large amount of pollen must be produced. Spore producing plants like mosses and ferns are not allergens.
Molds also can cause the drips .
They are everywhere, inside, outside and are hard to remove. Doctors will usually seek the aid of an allergy shot to get relief. The shots may take more than a year to build up to a level that alleviates symptoms. Dosage of the shot is very weak. A child may have to go once or twice a week and the every three weeks when top strength is met.