All You Need to Know About Allergies

What are allergies and allergy symptoms? How are allergies diagnosed and treated? National Jewish Health Allergy and Immunology expert Flavia Hoyte, MD, answers these questions in this video.


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Allergies are the body’s exuberant response to something that’s actually harmless and really anything that the body gets exposed to can cause an allergy.

In terms of what people are allergic to, most commonly, medications, those can either be inhaled, ingested or by vane; foods are common allergens as well; you can be allergic to things that your skin comes into contact with; as well as aeroallergens, which are allergens that are in the environment, most commonly thought of as pollens during the growing seasons or cat dander, dust mites, mold.

So, stinging insects can cause allergy as well.


Symptoms of Allergies

The symptoms are going to depend on what part of the body is getting exposed.

If your skin is getting exposed to an allergen, the most common symptoms is going to be a rash and you can get a rash that looks more like eczema or poison ivy or rashes like hives.

If you’re breathing in an allergen, then the most common symptoms are going to be nasal, so runny, itchy nose, congestion, sneezing, post nasal drip.

Allergens that are coming in through the nose can also affect the lungs and can flare underlying conditions like asthma and COPD.

In terms of the eyes, they’re very exposed to aeroallergens and so itchy, watery eyes are common symptoms when exposed to allergens in the environment.

And then when allergens are getting inside the body, such as food or drink, medications, then the symptoms can range anywhere from hives or rash all the way to anaphylaxis, where the whole body gets involved or at least more than one body system.

And those reactions can be very serious and even life threatening.


How to Diagnose Allergies

The most important thing is actually going to be the clinical history.

The clues that the patient gives a physician about what happened, when did it happen, has it happened more than once and in what context.

That’s really where we oftentimes make our diagnoses.

And then that clinical history guides us to testing in order to confirm.

So the major test that we use in allergy is going to be skin testing where a little drop is put on the skin and poked through and then blood testing where we look for the IGE antibody against a specific allergen.

There’s also intradermal testing where some allergen is injected under the skin, so that has a little bit of a higher sensitivity, in terms of picking up maybe more subtle allergies.

And tests are available, blood tests and skin tests, for all the different kinds of allergens we look at, so aeroallergens in the environment, for food allergies, for stinging insects allergies.

The only thing that doesn’t have validated testing is going to be drug allergy, except for penicillin.


Treatment Options for Allergies

The first step will be helping to identify what somebody is allergic to and then once we identify we talk about different ways to avoid that item.

There are ways to make somebody temporally unallergic, if you are talking about a drug allergy and then they can get through a course of a medication.

We can also do allergy shots for environmental allergens.

And then in experimental phase right now is a desensitization for foods.

And so by gradually increasing the amount of food that’s ingested, patients can then tolerate food allergens.

If somebody cannot avoid it and we cannot make them temporally or permanently unallergic, then we usually try to treat the symptoms so depending on where the symptom is the treatment will vary by trying to really make patients as comfortable as possible with allergens they are not able to avoid.

Visit for more information on what you can do to treat your allergies.

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