Clinically important
* Acute Radiation Syndrome* Acute viral hepatitis
* Acute appendicitis, where it accompanies the presenting symptom of abdominal pain, often with vomiting
* Addison's disease
* Atypical pneumonia (mycoplasma)
* AIDS
* Anorexia nervosa
* Anxiety disorder
* Cancer
* Chronic renal failure
* Congestive heart failure, perhaps due to congestion of the liver with venous blood
* Crohn's Disease
* Dementia
* Depression
* Hypervitaminosis D
* Metabolic disorders, particularly Urea cycle disorders
* Sickness behavior
* Superior Mesenteric Artery Syndrome
* Tuberculosis
* Ulcerative Colitis
Drugs
* Amphetamine, dextroamphetamine* Antidepressants can have anorexia as a side effect
* Dextromethylphenidate
* Abrupt cessation of appetite-increasing drugs, such as cannabis and corticosteroids
* Methamphetamine (treatment of ADD & ADHD and narcolepsy)
* Methylphenidate
* Chemicals that are members of the phenethylamine group. (Individuals with anorexia nervosa may seek them to suppress appetite)
* Stimulants
* Topiramate (as a side effect)
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 disorder) can cause an individual to temporarily lose all interest in eating.
Adapted from the Wikipedia article Anorexia (symptom), under the G. N. U. Free Documentation License. Please also see http://en.wikipedia.org/wiki
