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An allergy is a long term condition in which the immune system mounts an abnormal reaction to an ordinarily harmless substance called an allergen.[1] Allergic reactions vary in severity from relatively minor symptoms to life-threatening anaphylactic shock.[1]

Allergic reaction[edit | edit source]

An allergic reaction occurs when the person's immune system produces Immunoglobulin E (IgE). When the person comes into contact with an allergen, the IgE travels to cells that release histamine and other chemicals; it is the histamine that causes the allergic reaction.[1]

A severe, systemic allergic reaction is called anaphylaxis or anaphylactic shock, and can be life-threatening.[2][3]

Prevalence[edit | edit source]

Symptom recognition[edit | edit source]

The onset of new allergies is a potential symptom of Long COVID in the World Health Organization's definition.[4]

Notable studies[edit | edit source]

  • 1988, Allergy and the chronic fatigue syndrome[5]
  • 1998, Chronic fatigue syndrome: identification of distinct subgroups on the basis of allergy and psychologic variables[6](Full text)
  • 2015, Increased Risk of Chronic Fatigue Syndrome Following Atopy: A Population-Based Study[7]

See also[edit | edit source]

Learn more[edit | edit source]

References[edit | edit source]

  1. "Allergies Overview". American Academy of Allergy, Asthma & Immunology. Retrieved October 20, 2021.
  2. "Anaphylaxis". National Health Service. October 20, 2017. Retrieved February 18, 2021.
  3. "Definition of ANAPHYLACTIC SHOCK". Merriam-Webster Dictionary. Retrieved February 18, 2021.
  4. Soriano, Joan B.; Allan, Maya; Alsokhn, Carine; Alwan, Nisreen A.; Askie, Lisa; Davis, Hannah E.; Diaz, Janet V.; Dua, Tarun; de Groote, Wouter; Jakob, Robert; Lado, Marta; Marshall, John; Murthy, Srin; Preller, Jacobus; Relan, Pryanka; Schiess, Nicoline; Seahwag, Archana (October 6, 2021), A clinical case definition of post COVID-19 condition by a Delphi consensus, World Health Organization (WHO) clinical case definition working group on post COVID-19 condition, World Health Organization
  5. Straus, S.E.; Dale, J.K.; Wright, R.; Metcalfe, D.D. (May 1988). "Allergy and the chronic fatigue syndrome". The Journal of Allergy and Clinical Immunology. 81 (5 Pt 1): 791–795. ISSN 0091-6749. PMID 2836490.
  7. Yang, Tse-Yen; Kuo, Haung-Tsung; Chen, Hsuan-Ju; Chen, Chih-Sheng; Lin, Wei-Ming; Tsai, Shin-Yi; Kuo, Chua-Nan; Kao, Chia-Hung (July 2015). "Increased Risk of Chronic Fatigue Syndrome Following Atopy: A Population-Based Study". Medicine. 94 (29): e1211. doi:10.1097/MD.0000000000001211. ISSN 1536-5964. PMC 4603016. PMID 26200644.

World Health Organization (WHO) - "A specialized agency of the United Nations that is concerned with public health. It was established on 7 April 1948, and is headquartered in Geneva, Switzerland. The WHO is a member of the United Nations Development Group. Its predecessor, the Health Organization, was an agency of the League of Nations." The International Statistical Classification of Diseases and Related Health Problems (ICD) is maintained by WHO.

The information provided at this site is not intended to diagnose or treat any illness.
From MEpedia, a crowd-sourced encyclopedia of ME and CFS science and history.