An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing.
Types of Allergies
- Drug Allergy
- Food Allergy
- Insect Allergy
- Latex Allergy
- Mold Allergy
- Pet Allergy
- Pollen Allergy
|Affected organ||Common signs and symptoms|
|Nose||Swelling of the nasal mucosa (allergic rhinitis) runny nose, sneezing|
|Eyes||Redness and itching of the conjunctiva (allergic conjunctivitis, watery)|
|Airways||Sneezing, coughing, bronchoconstriction, wheezing and dyspnea, sometimes outright attacks of asthma, in severe cases the airway constricts due to swelling known as laryngeal edema|
|Ears||Feeling of fullness, possibly pain, and impaired hearing due to the lack of eustachian tube drainage.|
|Skin||Rashes, such as eczema and hives (urticaria)|
|Gastrointestinal tract||Abdominal pain, bloating, vomiting, diarrhea|
Severe allergic reaction
- swelling of the throat and mouth
- difficulty breathing
- blue skin or lips
- collapsing and losing consciousness
Some facts about allergies.
How Common Are Allergies?
- More than 50 million Americans have experienced various types of allergies each year. 
- Allergies are the 6th leading cause of chronic illness in the U.S. 
How Many People Die from Allergies?
- The most common triggers for anaphylaxis, a life-threatening reaction, are medicines, food and insect stings. Medicines cause the most allergy related deaths.
- Black Americans and older adults have the highest rates of death due to allergic reactions to medicines, food or unknown allergens.
- Allergic rhinitis affects 35.9 million people in the United States, or 11% of the total population.
- About 32 million people have food allergies in the U.S.
- About 26 million (10.8%) U.S. adults have food allergies.
- About 5.6 million (7.6%) U.S. children have food allergies.
- In 2018, 4.8 million (6.5%) children under 18 years of age had food allergies over the previous 12 months.
- Milk is the most common allergen for children, followed by egg and peanut.
- Shellfish is the most common allergen for adults, followed by peanut and tree nut.
References1.American College of Allergy, Asthma, and Immunology. (2018). Allergy Facts. http://acaai.org/news/facts-statistics/allergies
2.Wood, R. A., Camargo, C. A., Lieberman, P., Sampson, H. A., Schwartz, L. B., Zitt, M., Collins, C., Tringale, M., Wilkinson, M., Boyle, J., & Simons, F. E. R. (2014). Anaphylaxis in America: the prevalence and characteristics of anaphylaxis in the United States. The Journal of Allergy and Clinical Immunology, 133(2), 461–467. https://doi.org/10.1016/j.jaci.2013.08.016
3.Jerschow, E., Lin, R. Y., Scaperotti, M. M., & McGinn, A. P. (2014). Fatal anaphylaxis in the United States 1999-2010: temporal patterns and demographic associations. The Journal of Allergy and Clinical Immunology, 134(6), 1318-1328.e7. https://doi.org/10.1016/j.jaci.2014.08.018
4."AAAAI – rhinitis, sinusitis, hay fever, stuffy nose, watery eyes, sinus infection". Archived from the original on 18 July 2011. Retrieved 3 December 2007.
5.Gupta, R. S., Warren, C. M., Smith, B. M., Jiang, J., Blumenstock, J. A., Davis, M. M., Schleimer, R. P., & Nadeau, K. C. (2019). Prevalence and Severity of Food Allergies Among US Adults. JAMA Network Open, 2(1), e185630. https://doi.org/10.1001/jamanetworkopen.2018.5630
6.Gupta, R. S., Warren, C. M., Smith, B. M., Blumenstock, J. A., Jiang, J., Davis, M. M., & Nadeau, K. C. (2018). The Public Health Impact of Parent-Reported Childhood Food Allergies in the United States. Pediatrics, 142(6). https://doi.org/10.1542/peds.2018-1235
7.Turnbull, J. L., Adams, H. N., & Gorard, D. A. (2014). Review article: the diagnosis and management of food allergy and food intolerances. Alimentary Pharmacology & Therapeutics, 41(1), 3–25. https://doi.org/10.1111/apt.12984