Learning More About Allergies
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.
The allergens that most commonly cause seasonal allergies are:
- Tree pollen (see Tree Pollen Allergy)
- Grass pollen (see Grass Pollen Allergy)
- Weeds (see Ragweed Allergies)
- Fungi and molds (see Mold Allergy).
The allergens that most commonly cause perennial allergies are:
- House dust (see House Dust Allergy)
- Dust mites (see Dust Mite Allergy)
- Cockroaches (see Cockroach Allergy)
- Animals (see Pet Allergy)
- Cigarette smoke (see Cigarette Smoke Allergy)
- Fungi or molds.
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.)