Allergy Overview

Allergy Overview

An allergy is an exaggerated response from your immune system to a normally harmless substance. Common allergens (the name given to these trigger substances) include pollen, mold, dust mites, pet dander, food and chemicals. Allergies affect about one out of every five Americans.

What Causes Allergies?

Your immune system is your body’s first line of defense against germs and bacteria. Comprised of cells, proteins, tissues and organs, it is essential in maintaining your health and preventing infections. When a threat is perceived, the immune system responds by attacking the substances that are invading the body.

Allergies are the result of the immune system responding in an over protective manner to a harmless substance. When an allergen is encountered, antibodies – proteins designed to protect against foreign invaders – are produced. These trigger the release of chemicals called histamines, which are responsible for the telltale symptoms of allergies.

What Are the Symptoms of Allergies?

Allergies may be seasonal or occur year-round. Hay fever caused by pollen from grasses, trees and weeds is the most common seasonal allergy. Symptoms include:

  • Stuffy and/or runny nose
  • Sneezing
  • Itchiness in the nose and throat
  • Postnasal drip
  • Itchy, watery eyes
  • Pressure in the ears
  • Fatigue

Year-round allergies produce the same symptoms; common ones are mold, dust mites, pet dander, environmental irritants like smog or smoke, medications and chemicals. Insect stings and bites fall in this category, too.They can produce a life-threatening allergic reaction known as anaphylaxis.

How Are Allergies Treated?

Avoiding the allergen trigger is the best method of preventing allergy attacks. Medications are available to reduce your immune system’s reaction and provide symptom relief; drugs such as antihistamines, decongestants and corticosteroids can all prove helpful.

Those whose allergies do not respond to medical treatment may be given allergy shots (immunotherapy) in an effort to build up a tolerance to the offending substance through regular injections given for several years.

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