DERRY TOWNSHIP, DAUPHIN COUNTY—From peanuts to milk and even chocolate, people can be allergic to just about anything. Susan Gratza is raising two children with severe food allergies. She says getting proper treatment and knowing more about the condition has helped her to raise her children to live a normal life. Her children receive care from Penn State Hershey Medical Center and their Allergy and Immunology Department.
Below is information about some of the symptoms and treatment of allergies, from Penn State Hershey Medical Center:
Definition: An allergy is an exaggerated immune response or reaction to substances that are generally not harmful.
Causes: Allergies are relatively common. Both genetics and environmental factors play a role.
The immune system normally protects the body against harmful substances, such as bacteria and viruses. It also reacts to foreign substances called allergens, which are generally harmless and in most people do not cause a problem.
But in a person with allergies, the immune response is oversensitive. When it recognizes an allergen, it releases chemicals such as histamines. which fight off the allergen. This causes itching, swelling, mucus production, muscle spasms, hives, rashes, and other symptoms, which vary from person to person.
Common allergens include pollen, mold, pet dander, and dust. Food and drug allergies are common. Allergic reactions can also be caused by insect bites, jewelry, cosmetics, spices, and other substances.
Some people have allergy-like reactions to hot or cold temperatures, sunlight, or other environmental triggers. Sometimes, friction (rubbing or roughly stroking the skin) will cause symptoms.
A specific allergy is not usually passed down through families (inherited). However, if both your parents have allergies, you are likely to have allergies. The chance is greater if your mother has allergies.
Allergies may make certain medical conditions such as sinus problems, eczema, and asthma worse.
Symptoms: Allergy symptoms vary, but may include:
Breathing problems (coughing, shortness of breath) Burning, tearing, or itchy eyes Conjunctivitis (red, swollen eyes) Coughing Diarrhea Headache Hives Itching of the nose, mouth, throat, skin, or any other area Runny nose Skin rashes Stomach cramps Vomiting Wheezing What part of the body is contacted by the allergen plays a role in the symptoms you develop. For example:
Allergens that are breathed in often cause a stuffy nose, itchy nose and throat, mucus production, cough, or wheezing Allergens that touch the eyes may cause itchy, watery, red, swollen eyes. Eating something you are allergic to can cause nausea, vomiting, abdominal pain, cramping, diarrhea, or a severe, life-threatening reaction Allergens that touch the skin can cause a skin rash, hives, itching, blisters, or even skin peeling Drug allergies usually involve the whole body and can lead to a variety of symptoms Exams and Tests The health care provider will perform a physical exam and ask questions such as when the allergy occurs.
Allergy testing may be needed to determine if the symptoms are an actual allergy or caused by other problems. For example, eating contaminated food (food poisoning) may cause symptoms similar to food allergies. Some medications (such as aspirin and ampicillin) can produce non-allergic reactions, including rashes. A runny nose or cough may actually be due to an infection.
Skin testing is the most common method of allergy testing. One type of skin testing is the prick test. It involves placing a small amount of the suspected allergy-causing substances on the skin, and then slightly pricking the area so the substance moves under the skin. The skin is closely watched for signs of a reaction, which include swelling and redness. Skin testing may be an option for some young children and infants.
Other types of skin tests include patch testing and intradermal testing. For detailed information, see:Allergy testing
Blood tests can measure the levels of specific allergy-related substances, especially one called immunoglobulin E (IgE).
A complete blood count (CBC), specifically the eosinophil white blood cell count, may also help reveal allergies.
In some cases, the doctor may tell you to avoid certain items to see if you get better, or to use suspected items to see if you feel worse. This is called "use or elimination testing." This is often used to check for food or medication allergies.