Allergies occur when the immune system responds to a substance. Common examples include dust allergies, pollen allergies (causing hay fever and respiratory allergies) and food allergies. But there are many other types of allergy. An allergic reaction can be dangerous when it leads to an anaphylactic reaction (anaphylaxis, anaphylactic shock) ...

... More on Allergies »

Introduction: Allergies

Asthma and allergic diseases, such as allergic rhinitis (hay fever), food allergy, and atopic dermatitis (eczema), are common for all age groups in the United States. For example, asthma affects more than 17 million adults and more than 7 million ...1

... More on Allergies »

Symptoms of Allergies

Symptoms in the eye include redness, itching, tearing, burning, stinging, and watery discharge, although usually not severe enough to require medical attention. ...Source: NEI (NIH)2 ...

... More Symptoms of Allergies »

Complications of Allergies

Airborne Allergy

Source: MedLinePlus Magazine (NIH)3 ...

... More on Complications of Allergies »

Causes of Allergies

People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are

Normally, your immune system fights germs. It is your body's defense ...4

... More Causes of Allergies »

Causes List for Allergies

Some possible causes of Allergies or similar disorders may include:5

... Full Causes List for Allergies »

Types of Allergies

General types of allergies include:

Respiratory Allergies: Specific types of allergens that may provoke respiratory symptoms include:

Food Allergies: Types of food allergies include:

... More Types of Allergies »

Types of Allergies

Problem foods for people with allergies In adults, the foods that most often cause allergic reactions include:

  • Shellfish, such as scallops, oysters, shrimp, crayfish, lobster, and crab
  • Peanuts
  • Tree nuts, such as walnuts, cashews, and pecans
  • Fish
  • Eggs

Source: OWH ...6

... More Types of Allergies »

Diagnosis of Allergies

If your symptoms become persistent and bothersome, visit your family physician or an allergist. They can test for allergy sensitivities by using a skin or blood test. The test results, along with a medical exam and information about when and ...7

... More on Diagnosis of Allergies »

Genetics of Allergies

Allergies run in families. Your children’s chances of developing allergies are higher if you have them. ...Source: NIH News in Health (NIH)8 ...

... More on Genetics of Allergies »

Risk Factors for Allergies

Who's most at risk? It isn't fully understood why some people become oversensitive to allergens, although you're more likely to develop an allergy if there's a history of allergies in your family. If this is the case, you're ...9

... More on Risk Factors for Allergies »

Misdiagnosis: Allergies

Allergies can be undiagnosed or in some cases can be misdiagnosed as another disorder. Undiagnosed Allergies: Not everyone is aware initially of their allergies. Children may have undiagnosed allergies which are only detected on the first exposure to an allergen ...

... More about Misdiagnosis of Allergies »

Treatments: Allergies

A recent study found that people with asthma and allergies may be able to alleviate asthma symptoms by reducing allergen levels in their homes. “Some simple measures—washing bedding in hot water, vacuuming and steam-cleaning, and using high-efficiency ...10

... More Treatment Information for Allergies »

Prevention of Allergies

Avoiding your allergy triggers is the best way to control your symptoms. But triggers aren’t always easy to identify. Notice when and where your symptoms occur. This can help you figure out the cause. “Most people with allergies are ...11

... Prevention of Allergies »

Research for Allergies

Seasonal Allergy Research at NIH: Asthma and Allergic Diseases Cooperative Research Centers: In 1971, the National Institute of Allergy and Infectious Diseases (NIAID) established its Asthma and Allergic Diseases Centers to conduct basic and clinical research on the mechanisms, diagnosis ...12

... More on Research for Allergies »

   •   •   •


  1. Source: NIAID (NIH): topics/ allergicdiseases/ Pages/ default.aspx
  2. Source: NEI (NIH): health/ cornealdisease
  3. Source: MedLinePlus Magazine (NIH): magazine/ issues/ spring15/ articles/ spring15pg26-27.html
  4. Source: MedLinePlus (NIH): allergy.html
  5. Source: Algorithmically Generated List
  6. Source: OWH (DHHS): fitness-and-nutrition/ special-food-issues
  7. Source: NIH News in Health (NIH): issue/ jun2016/ feature2
  8. ibid.
  9. Source: NHS Choices UK: conditions/ allergic-rhinitis/ causes/ 
  10. Source: NIH News in Health (NIH): 2008/ May/ docs/ 01features_02.htm
  11. Source: NIH News in Health (NIH): issue/ jun2016/ feature2
  12. Source: MedLinePlus Magazine (NIH): magazine/ issues/ spring15/ articles/ spring15pg26-27.html

   •   •   •

Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.