Anorexia

Anorexia (deriving from the Greek "α(ν)-" (a(n)-, a prefix that denotes absence) + "όρεξη (orexe)</i> = appetite) is the decreased sensation of appetite. While the term in non-scientific publications is often used interchangeably with anorexia nervosa, many possible causes exist for a decreased appetite, some of which may be harmless, while others indicate a serious clinical condition, or pose a significant risk. 
==Causes==
* Satiation following the consumption of food. This is normal and is called postprandial anorexia.
===Clinically important=== 
* Acute Radiation Syndrome.
* AIDS.
* Anorexia nervosa.
* acute appendicitis where it accompanies the presenting symptom of abdominal pain, often with vomiting.
* Cancer.
* Chronic renal failure.
* Congestive heart failure, perhaps due to congestion of the liver with venous blood.
* Crohn's Disease.
* Dementia.
* Severe Depression.
* Sickness behavior[1][2]
* Superior Mesenteric Artery Syndrome.
* Ulcerative Colitis.
===Drugs===
* Amphetamine (Adderall), dextroamphetamine (Dexedrine & Dextrostat).
* Antidepressants can have anorexia as a side effect.
* Dextromethylphenidate (Focalin).
* Abrupt cessation of appetite-increasing drugs, such as cannabis.
* Methamphetamine (Desoxyn) (treatment of ADD & ADHD and narcolepsy).
* Methylphenidate (Ritalin & Concerta).
* Chemicals that are members of the phenethylamine group. (Individuals with anorexia nervosa may seek them to suppress appetite).
* Stimulants.
===Other===
* Altitude when it can also accompany sickness.
* Preoperative anorexia drugs may be prescribed as a prophylactic to ensure no food will back up into the esophagus which might risk pulmonary aspiration.
* Significant emotional pain caused by an event (rather than a mental illness) can cause an individual to temporarily lose all interest in eating.
==See also==
*Melancholic features
Category:Symptoms