People with pollen allergies may take pains to prevent the sneezing, wheezing, itching and general discomfort precipitated by the great outdoors during the spring, summer and autumn months. However, pollinating trees, grass and weeds are not the only culprits to incite hay fever�s undesirable symptoms.

Pollen is one of the most common types of allergens. Grains of pollen are expelled into the air from trees, grasses and weeds in different regions and at different times of the year. Coughing is one of many symptoms of pollen allergy, which can be relieved with proper treatment.

Allergies can produce a variety of symptoms, but one thing everyone affected with allergies experiences is discomfort. People can be allergic to pollen, pet dander, dust, foods and plants. Pollen allergies most commonly cause nasal congestion, a runny nose, sore throat and itchy eyes.

Allergic reactions to eucalyptus pollen occur rarely in the United States, due to its lower airborne prevalence and a relatively small tree population. Native to Australia, eucalyptus, or gum, trees were introduced to the Western Coastal U.S. and are cultivated sparsely in other areas.

A sore throat is discomfort, pain or swelling in the throat, according to MedlinePlus. A pollen allergy causes the hormone, histamine, to be released in the body, causing inflammation and irritation in the throat. Once the throat swells, it becomes increasingly sensitive and agitated.

Spring brings leaves to the oak trees and sends oak pollen into the air, causing millions of allergy sufferers to reach for the antihistamines and tissue. Oak trees normally pollinate in March, April and May, with more pollen appearing in the early morning hours.

If you have an allergy to ragweed -- a type of flowering plant common throughout North America -- you have likely experienced such symptoms as a runny or stuffy nose, sneezing or sore throat.

Cedar allergy, or cedar fever, is a form of seasonal allergic rhinitis that shares the usual hay fever symptoms.