The pollen from trees and shrubs cause hayfever. It is a type of allergy which doctors call it as seasonal allergic rhinitis. The symptoms of hayfever are sneezing, watery eyes and a stuffy nose. The tree pollen allergy is seasonal and is caused usually between February and June. The trees release pollens which is either carried by winds and insects. It must be noted that not all pollens cause hayfever. The symptoms of allergy caused by tree pollens can vary from place to place according to the weather condition of the country and the type of tree pollen that caused the allergy. On persistence of the above mentioned symptoms, you need to go to doctor immediately for a test.