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About Allergy and Immunology

Allergy and Immunology is the medical specialty that focuses on issues concerning the immune system – the body’s defense system against foreign microorganisms such as bacteria and viruses that cause diseases.  A healthy immune system will directly “attack” the foreign microorganism or will produce antibodies (proteins) to attack the microorganism.  When the immune system has an abnormal reaction to a substance, it produces allergic antibodies, resulting in allergies and asthma.  When the immune system malfunctions, it produces antibodies that attack and destroy healthy tissue in the body, resulting in autoimmune disorders and immunodeficiency disorders.

Allergies | Asthma | Skin Disorders | Immunodeficiency Disorders



Allergies affect one out of four people in the United States and are the fifth leading chronic disease among all ages.  Allergies can affect anyone of any age or gender.  Some risk factors for allergies include heredity, stress, hormones, smoke, fragrances or other environmental irritants.

With allergies, the immune system overreacts and responds to external factors (allergens) such as pollen, dust, food, etc.  This overreaction causes a wide range of symptoms including coughing, sneezing, watery and itchy eyes, and a runny nose.  In some cases, it can also cause hives, rashes and difficulty breathing. When severe, it can even lead to death.

Common allergies include:

  • Food Allergies – Food that most often trigger an allergic reaction includes peanuts, shrimp, fish, eggs and milk.
  • Environmental Allergies – This type of allergy includes air born substances such as pollen from trees, grasses, weeds, dust, mold and animal dander.
  • Stinging Insect Allergies – This allergy is due to the venom in bee stings, ant bites, mosquito bites, etc.
  • Hay Fever – Hay fever is caused by nasal irritation and inflammation due to the pollen from ragweed, grasses and trees as well as mold.
  • Skin Allergies – Allergic reaction when the skin – mainly face, hands and legs – is exposed to allergens and toxins.

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Asthma is considered a chronic lung disease.  During an asthma attack, the lining of the airways become swollen and inflamed causing muscle spasms that limit the airflow to and from the lungs.  This common disease affects an estimated 16 million Americans, including children.

Common symptoms for asthma include difficulty breathing, a tight feeling in the chest, coughing and wheezing.  Factors that can cause an asthma attack include contact with allergens (grass, dust or animals), contact with smoke or strong smells, exercise and viral infections.

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Skin Disorders

Skin disorders, such as contact dermatitis and eczema, are caused when the body’s immune system has an abnormal response to external factors.

  • Contact Dermatitis – Skin rash as a result of coming in contact with poison ivy, detergents, cleaning products, cosmetics, hair dye, etc.
  • Eczema – Symptoms of eczema include dry, itchy and scaly skin with a rash.  Eczema can be caused by allergies, upper respiratory infections and stress, and is not contagious.

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Immunodeficiency Disorders

Immunodeficiency disorders occur when there is a defect in the normal immune system, such as when specialized white blood cells do not work as they should or when the body does not produce enough antibodies.  Because a normal immune system protects us from infections, patients with immunodeficiency disorders tend to have recurrent infections – such as colds, the flu, sinus infections and ear infections.

There are two types of immunodeficiency disorders: congenital (primary) which are hereditary and present at birth, and acquired (secondary) which develop later in life and can be the result of aging, malnutrition and use of certain drugs (such as chemotherapy and anticonvulsants).  These disorders include:


  • DiGeorge Syndrome
  • Primary Immunodeficiency Disease
  • Common Variable Immunodeficiency
  • Agammaglobulinemia
  • Wiskott-Aldrich Syndrome


  • Acquired Immunodeficiency Syndrome

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