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Anorexia (deriving from the Greek "α(ν)-" (a(n)-, a prefix that denotes absence) + "όρεξη (orexe) = appetite) is the decreased sensation of appetite.
While the term in non-scientific publications is often used interchangeably with one of its subtypes, anorexianervosa, there are many possible causes for a decreased appetite, some of which may be harmless while others pose significant risk for the person.
Anorexia may also be seen in congestive heart failure, perhaps due to congestion of the liver with venous blood.
Anorexianervosa is a complex disease, involving psychological and sociological components.
Anorexianervosa alters an individual's body image to the point where the person perceives himself or herself as fat irrespective of his or her actual size.
Anorexianervosa has the highest death rate of all mental illnesses, with as many as 20% of anorexics eventually dying of complications of the disease, usually from failure of the heart or another organ failure or from low levels of potassium.
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