Editing Hyperthermia (section)

===Situational===
[[File:heat-related deaths.jpg|upright=1.6|thumb|alt=Chart showing number of heat-related deaths by date of occurrence and race of decedent versus heat index, Chicago, July 11–27, 1995]]
Situational heat stroke occurs in the absence of exertion. It mostly affects the young and elderly. In the elderly in particular, it can be precipitated by medications that reduce vasodilation and sweating, such as [[anticholinergic]] drugs, antihistamines, and diuretics.<ref name=Harrisons /> In this situation, the body's tolerance for high environmental temperature may be insufficient, even at rest.

Heat waves are often followed by a rise in the death rate, and these 'classical hyperthermia' deaths typically involve the elderly and infirm. This is partly because thermoregulation involves cardiovascular, respiratory and renal systems which may be inadequate for the additional stress because of the existing burden of aging and disease, further compromised by medications. During the July 1995 heatwave in Chicago, there were at least 700 heat-related deaths. The strongest risk factors were being confined to bed, and living alone, while the risk was reduced for those with working air conditioners and those with access to transportation. Even then, reported deaths may be underestimated as diagnosis can be mis-classified as stroke or heart attack.<ref>{{cite journal|title=Heat-related deaths during the July 1995 heat wave in Chicago |vauthors=Semenza JC, Rubin CH, Falter KH, Selanikio JD, Flanders WD, Howe HL, Wilhelm JL |date=July 1996 |journal=New England Journal of Medicine |volume=335 |issue=2 |pages=84–90 |pmid=8649494 |doi=10.1056/NEJM199607113350203 |url=http://rcin.org.pl/Content/40952|doi-access=free }}</ref>