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{{Merge to|Disease|date=May 2010}}
#REDIRECT [[Disease#Terminology]]
'''Illness''' (sometimes referred to as '''ill-health''' or '''ailment''') is a state of poor [[health]]. Illness is sometimes considered another word for [[disease]],<ref>{{DorlandsDict|four/000052397|illness}}</ref> but others maintain that fine distinctions exist.<ref name="pmid3567788">{{cite journal |author=Emson HE |title=Health, disease and illness: matters for definition |journal=CMAJ |volume=136 |issue=8 |pages=811–3 |year=1987 |month=April |pmid=3567788 |pmc=1492114 |doi= |url=}}</ref> This article discusses the definition of illness as the subjective perception by a patient of an objectively defined disease.<ref name="pmid3567791">{{cite journal |author=McWhinney IR |title=Health and disease: problems of definition |journal=CMAJ |volume=136 |issue=8 |pages=815 |year=1987 |month=April |pmid=3567791 |pmc=1492121 |doi= |url=}}</ref>

The mode of being [[healthy]] includes, as defined by the [[World Health Organization]], " [...] a state of complete physical, mental and social well-being and not merely the absence of [[disease]] or [[wiktionary:infirmity|infirmity]]".<ref>[http://w3.whosea.org/aboutsearo/pdf/const.pdf WHO, 1946]</ref> When these conditions are not fulfilled, then one can be considered to have an illness or be ill. Medication and the science of [[pharmacology]] is used to cure or reduce symptoms of an illness or medical conditions. [[Developmental disability]] is a term used to describe severe, lifelong disabilities attributable to mental and/or physical impairments.

==Physical==
Conditions of the [[human body|body]] or [[mind]] that cause [[pain]], [[:wikt:dysfunction|dysfunction]], or distress to the person afflicted or those in contact with the person can be deemed an illness. Sometimes the term is used broadly to include injuries, disabilities, [[syndrome]]s, infections, [[symptom]]s, deviant behaviors, and atypical variations of structure and function, while in other contexts these may be considered distinguishable categories. A [[pathogen]] or [[infectious agent]] is a biological agent that causes disease or illness to its host. A [[passenger virus]] is a virus that simply hitchhikes in the body of a person or infects the body without causing symptoms, illness or disease.

==See also==

* [[Convalescence]]
* [[Wellness (alternative medicine)]] is used to mean a healthy balance of the mind-body and spirit that results in an overall feeling of well-being.

==References==
{{reflist}}

{{Medical conditions}}

[[Category:Medical terminology]]
[[Category:Health]]

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[[ar:المرض]]

Revision as of 19:21, 2 February 2013