Skip to content

Allergies Health Center

Symptoms of an Allergic Reaction

Font Size
A
A
A

Symptoms of an allergic reaction vary depending on the body part affected and the severity of the reaction. Some reactions affect many areas, while others affect just one area. Reactions to the same allergen vary by individual.

Symptoms of an allergic reaction include any, some, or many of the following:

Recommended Related to Allergies

Tips to Manage Allergies While Traveling

Try these tips for allergy relief when you’re on vacation or traveling on business. Travel Insurance: Check pollen counts at your destination. Pack your own hypoallergenic pillow cover and allergy medicine in a carry-on bag. No Venting: On road trips, keep the air vent closed. You'll breathe recirculated air, not pollen or pollution.  Smart Car: Take a vacuum to your car. Pollen and dust mites can easily cling to clothing, bringing more allergens into your home. Cruise Control:...

Read the Tips to Manage Allergies While Traveling article > >

  • Skin -- Redness, itching, swelling, blistering, weeping, crusting, rash, eruptions, or hives (itchy bumps or welts)
  • Lungs -- Wheezing, tightness, cough, or shortness of breath
  • Head -- Swelling of the face, eyelids, lips, tongue, or throat; headache
  • Nose -- Stuffy nose, runny nose (clear, thin discharge), sneezing
  • Eyes -- Red (bloodshot), itchy, swollen, or watery
  • Stomach -- Pain, nausea, vomiting, diarrhea, or bloody diarrhea

Anaphylaxis is serious, potentially life-threatening allergic reaction which is rapid, or sudden, and potentially life-threatening.

One sign of anaphylaxis is shock. Shock has a very specific meaning in medicine: the organs of the body are not getting enough blood because of dangerously low blood pressure. This drop in blood pressure happens when the large blood vessels suddenly expand. If the drop in blood pressure is sudden and drastic, it can lead to unconsciousness, even cardiac arrest and death.  

The person in shock may be pale or red, sweaty or dry, confused, anxious, or unconscious.

Breathing may be difficult or noisy, or the person may be unable to breathe.

 

WebMD Medical Reference

Reviewed by Luqman Seidu, MD on May 18, 2014

Today on WebMD

man blowing nose
Make these tweaks to your diet, home, and lifestyle.
Allergy capsule
Breathe easier with these products.
 
cat on couch
Live in harmony with your cat or dog.
Woman sneezing with tissue in meadow
Which ones affect you?
 

woman sneezing
Slideshow
Bottle of allergy capsules and daisies
Article
 
Urban blossoms
Slideshow
Woman blowing nose
Slideshow
 

Send yourself a link to download the app.

Loading ...

Please wait...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

Woman with itchy watery eyes
Slideshow
Allergy prick test
VIDEO
 
Man sneezing into tissue
Tools
woman with duster crinkling nose
Quiz