Skip to content
My WebMD Sign In, Sign Up

Allergies Health Center

Font Size

Symptoms of an Allergic Reaction

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

Stress Relief Strategies to Ease Allergy Symptoms

If you suffer with allergy symptoms, you know all about the stress of having a chronic condition. Not only is it difficult to breathe with allergy symptoms, but poor sleep can lead to fatigue and problems concentrating. Allergy medicines can cause appetite changes, low energy, and even irritability. All you want is relief: from the stress, the symptoms, all of it.

Read the Stress Relief Strategies to Ease Allergy Symptoms 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
 

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