Learning More About Allergies

Seasonal Versus Perennial

Allergies can either be seasonal or perennial. Seasonal allergies occur at specific times of the year, while perennial allergies can occur throughout the year.
Of these two types of allergies, perennial allergies tend to be more difficult to treat.

Common Allergens

The allergens that most commonly cause seasonal allergies are:
The allergens that most commonly cause perennial allergies are:

What Are the Symptoms?

The symptoms of allergies are familiar to many. The most common airborne allergy symptoms include:
  • Sneezing, often with a runny or clogged nose
  • Coughing and postnasal drip
  • Itching eyes, nose, and throat
  • Watering eyes
  • Conjunctivitis (inflammation of the membrane that covers the eye)
  • "Allergic shiners" (dark circles under the eyes caused by increased blood flow near the sinuses)
  • "Allergic salute" (in a child, persistent upward rubbing of the nose that causes a crease mark on the nose).
(Click Allergy Symptoms to learn more about the symptoms of allergies.)
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Allergy Information

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