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What Is an Allergic Reaction?

Some people sneeze like crazy. Others get itchy hives or watery eyes. But whatever the reaction, it boils down to one thing: allergies.

If you have allergies, you have lots of company. As many as 30% of U.S. adults and 40% of children are in the same boat as you.

While your problem may seem to start in the nose or the eyes, allergies actually come from an immune system run wild.

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Why Allergic Reactions Happen

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Peanuts, eggs, or pollen, for example, can trigger reactions. They are called allergens.

During a reaction, your immune system releases antibodies. These are proteins that deliver a message to cells: Stop that substance! The cells then send out histamine, which causes blood vessels to expand, and other chemicals, and these trigger the allergy symptoms.

These antibodies are singled-minded. Each one targets only one type of allergen. That explains why someone might be allergic to peanuts but not to eggs.

You can come into contact with allergens in many ways: through the skin, eyes, nose, mouth, or stomach. This can cause your sinuses to clog up, inflame your skin, make it harder to breathe, or cause stomach problems.

What Things Most Often Cause an Attack?

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Some common allergens include:

  • Animal dander
  • Bee stings
  • Certain medications such as penicillin
  • Dust mites
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  • Insect bites
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  • Mold
  • Plants and pollens

The Symptoms, From Itchy Eyes to Sneezing

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Continued

If your allergy is severe, you may have a serious reaction called anaphylaxis. Some cases could be life-threatening and need urgent attention.

Here are some common types of allergies:

Hay fever: Also known as allergic rhinitis, it can cause:

Food allergies : You may feel tingling in your mouth. Your tongue, lips, throat, or face might swell up. Or you could get hives. In the worst cases, you might have anaphylaxis and will need medical help right away.

Eczema: Also known as atopic dermatitis, it is a skin condition. Most types of eczema are not allergies. But the disease can flare up when you're around things that cause an allergic reaction. Your body's immune system overreacts to substances, called allergens, that are usually not harmful. You might get hives, itching, swelling, sneezing, and a runny nose. You might have it if you have itching, redness, and peeling or flaking.

Medications: If you’re allergic to a certain drug, you may get a rash, facial swelling, or hives. You could find yourself wheezing. In severe cases, you may develop anaphylaxis.

Stings: If you’re allergic to bees or other insects you may get:

  • A large area of swelling, known as edema, at the site of the sting
  • Itching or hives all over your body
  • Shortness of breath, wheezing, chest tightness, or a cough

NBS senior statistician Sheng Guoqing attributed the slowdown mainly due to a 1.4-percent decline in food prices, which were down for the first time in 15 years.

Anaphylaxis: What Is It and How to Get Help

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They can quickly go from a mild rash or runny nose to serious problems such as a hard time breathing, tightness in the throat, hives or swelling, nausea or vomiting, and fainting or dizziness. Some people can get a rapid pulse or their heart will stop beating.

Continued

If you’ve had previous attacks or know you are at risk for anaphylaxis, your doctor might prescribe medicine that you can give yourself, or that someone else can give you. Adrenaclick, Auvi-Q, EpiPen, Symjepi or a generic version of an epinephrine auto-injector​​​​​​​ are devices loaded with this medicine.

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How Can I Get Relief?

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The number of moviegoers in 2016 reached 1.37 billion, an increase of nearly 8.9 percent year-on-year.

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WebMD Medical Reference Reviewed by Nayana Ambardekar, MD on March 7, 2020

Sources

SOURCES:

He did several makeup tests to get the look that would so dramatically change Mr. Carell. “We were literally creating a new human being,” Mr. Corso said.

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Mayo Clinic: “Allergies.”

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