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Subnormal body temperature
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{{stub}} A '''subnormal or low body temperature''' is a body temperature below the normal, healthy range. Historically a normal body temperature was considered to be 98.6F (37°C), but more recent research has found the healthy temperature range to be between 97.5 F (36.4 C) and 97.9 F (36.6 C).<ref name="cleveland" /> ==Body temperature influences== Body temperature is known to be slightly higher or lower due to many different influences, including: * small variations up or down during a typical day<ref name="cleveland">{{Cite web|url=https://health.clevelandclinic.org/body-temperature-what-is-and-isnt-normal/ | title = Normal Temperature: What Should Your Body Temp Be? | date = 2021-10-28 | website = Cleveland Clinic|language=en-US|access-date=2022-10-04}}</ref> * age: infants and children under age 10 have a much lower normal temperature range, adolescents have a lower range to adults, people aged 65 or older have a lower healthy temperature range than younger adults<ref name="cleveland" /> * sex, and ovulation<ref name="cleveland" /> * where the temperature is taken, e.g., ear (which is considered closest to [[brain]] temperature), rectal, oral, forehead<ref name="feverNHS">{{Cite web|url=https://www.nhs.uk/conditions/fever-in-adults/ | title = High temperature (fever) in adults | last = | first = | authorlink = | last2 = | first2 = | authorlink2 = | date = 2020-04-07 | website = [[National Health Service]]|language=en|archive-url=|archive-date=|url-status=|access-date=2022-10-04}}</ref><ref name="ch">{{Cite book | title=Pediatric Surgery|chapter=Temperature Monitoring| date = 2012 |url=https://www.sciencedirect.com/science/article/pii/B9780323072557000131|pages=201β226 | last = Landsman | first = Ira S. | author-link = | last2 = Hays | first2 = Stephen R. | authorlink2 = | last3 = Karsanac | first3 = Christopher J. | authorlink3 = | last4 = Franklin | first4 = Andrew|isbn=978-0-323-07255-7|language=en|location=Philadelphia|publisher=Mosby | editor-last = Coran | editor-first = Arnold G.}}</ref> * Differences also exist between different people<ref name="BMJ2017">{{Cite journal | title = Individual differences in normal body temperature: longitudinal big data analysis of patient records | date = 2017-12-13|url=https://www.bmj.com/content/359/bmj.j5468|journal=BMJ|volume=359|pages=j5468 | last = Obermeyer | first=Ziad | last2 = Samra | first2 = Jasmeet K. | last3 = Mullainathan | first3=Sendhil|language=en|doi=10.1136/bmj.j5468|pmc=PMC5727437|pmid=29237616|issn=0959-8138}}</ref> * [[metabolism]] and circadian rhythm (body clock) * certain chronic medical conditions, (e.g., [[hypothyroidism]]: 0.013Β°C) or higher temperature (e.g., cancer: 0.020Β°C)<ref name="BMJ2017" /> ==Symptom recognition == The [[Canadian Consensus Criteria]] recognizes low body temperature as a ''neuroendocrine system'' symptom.<ref name="canadianconsensus-CCC">{{Citation | last1 = Carruthers | first1 = Bruce M. | authorlink1 = Bruce Carruthers | last2 = Jain | first2 = Anil Kumar | authorlink2 = Anil Kumar Jain | last3 = De Meirleir | first3 = Kenny L. | authorlink3 = Kenny De Meirleir | last4 = Peterson | first4 = Daniel L. | authorlink4 = Daniel Peterson | last5 = Klimas | first5 = Nancy G. | authorlink5 = Nancy Klimas | last6 = Lerner | first6 = A. Martin | authorlink6 = Martin Lerner | last7 = Bested | first7 = Alison C. | authorlink7 = Alison Bested | last8 = Flor-Henry | first8 = Pierre | authorlink8 = Pierre Flor-Henry | last9 = Joshi | first9 = Pradip | authorlink9 = Pradip Joshi | last10 = Powles | first10 = AC Peter | authorlink10 = A C Peter Powles | last11 = Sherkey | first11 = Jeffrey A. | authorlink11 = Jeffrey Sherkey | last12 = van de Sande | first12 = Marjorie I. | authorlink12 = Marjorie van de Sande | title = Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Clinical Working Case Definition, Diagnostic and Treatment Protocols| journal = Journal of Chronic Fatigue Syndrome | volume = 11 | issue = 2 | pages = 7-115 | date = 2003 | pmid = | doi = 10.1300/J092v11n01_02| url = http://www.investinme.org/Documents/PDFdocuments/CanadianDefinitionME-CFS.pdf}}</ref> However, a study by Jones et al. (1998) found patients meeting the CDC's 1988 [[Holmes criteria]] for chronic fatigue syndrome did not have a lowered core body temperature.<ref name="Jones1998">{{Cite journal | title = Core body temperature is normal in chronic fatigue syndrome | date = 1998-02-15|url=https://www.biologicalpsychiatryjournal.com/article/S0006-3223(97)83214-3/abstract|journal=Biological Psychiatry|volume=43|issue=4|pages=293β302 | last = Hamilos | first = Daniel L. | author-link = | last2 = Nutter | first2 = David | authorlink2 = | last3 = Gershtenson | first3 = Josh | authorlink3 = | last4 = Redmond | first4 = Daniel P. | authorlink4 = | last5 = Clementi | first5 = Jeannie D. Di | author-link5 = | last6 = Schmaling | first6 = Karen B. | authorlink6 = | last7 = Make | first7 = Barry J. | last8 = Jones | first8 = James F. | last9 = | first9 = |language=English|doi=10.1016/S0006-3223(97)83214-3|pmc=|pmid=|access-date=|issn=0006-3223|quote=|via=}}</ref> ===Comparison=== Subnormal body temperature is not the same as hypothermia, which is a medically dangerous body temperature of 95F (35Β°C) or lower and has complications including frostbite and trenchfoot.<ref name="medline">{{Cite web|url=https://medlineplus.gov/ency/article/000038.htm | title = Hypothermia|website=MedlinePlus Medical Encyclopedia|language=en|access-date=2018-10-09}}</ref> == See also == *[[Body temperature]] *[[Temperature dysregulation]] ==Learn more== *[https://health.clevelandclinic.org/body-temperature-what-is-and-isnt-normal/ Normal Temperature: What Should Your Body Temp Be?] - Cleveland Clinic == References == {{Reflist}} [[Category:Endocrine signs and symptoms]] [[Category:Signs and symptoms]]
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