Other
During the post-operative recovery period for a tonsillectomy or adenoidectomy, it is common for adult patients to experience a lack of appetite until their throat significantly heals (usually 10–14 days). Altitude sickness
Significant emotional pain caused by an event (rather than a mental disorder) can cause an individual to temporarily lose all interest in food. Several Twelve-step programs including Overeaters Anonymous tackle psychological issues members believe lead to forms of deprivation
Psychological stress
Experiencing grotesque or unappealing thoughts or conversations, or viewing similar images
Being in the presence of unappealing things such as waste matter, dead organisms, or bad smells

Complications
Complications of anorexia may result due to poor food intake. Poor food intake can lead to dehydration, electrolyte imbalances, anemia and nutritional deficiencies. These imbalances will worsen the longer that food is avoided. Sudden cardiac death
Anorexia is a relatively common condition that can lead patients to have dangerous electrolyte imbalances, leading to acquired long QT syndrome which can result in sudden cardiac death. This can develop over a prolonged period of time, and the risk is further heightened when feeding resumes after a period of abstaining from consumption. Refeeding syndrome
Care must be taken when a patient begins to eat after prolonged starvation to avoid the potentially fatal complications of refeeding syndrome. The initial signs of refeeding syndrome are minimal, but can rapidly progress to death. Thus, the reinitiation of food or oral intake is usually started slowly and requires close observation under supervision by trained healthcare professionals. This is usually done in a hospital or nutritional rehabilitation center.
Any form of decreased appetite that leads to changes in the body (such as weight loss or muscle loss) that is not done intentionally as part of dieting is clinically significant. Physiology of anorexia
Appetite stimulation and suppression is a complex process involving many different parts of the brain and body by the use of various hormones and signals. Appetite is thought to be stimulated by interplay between peripheral signals to the brain (taste, smell, sight, gut hormones) as well as the balance of neurotransmitters and neuropeptides  in the hypothalamus. Examples of these signals or hormones include neuropeptide Y, leptin, ghrelin, insulin, serotonin, and orexins (also called hypocretins). Anything that causes an imbalance of these signals or hormones can lead to the symptom of anorexia. While it is known that these signals and hormones help control appetite, the complicated mechanisms regarding a pathological increase or decrease in appetite are still being explored. Common causes
Acute radiation syndrome
Addisons disease
Alcoholism
Alcohol withdrawal
Anemia
Anorexia nervosa
Anxiety
Appendicitis
Babesiosis
Benzodiazepine withdrawal
Bipolar disorder
Cancer
Cannabinoid hyperemesis syndrome
Cannabis withdrawal
Celiac disease
Chronic kidney disease
Chronic pain
Common cold
Constipation
COPD
COVID-19
Crohns disease
Dehydration
Dementia
Depression
Ebola
Fatty liver disease
Fever
Food poisoning
Gastroparesis
Hepatitis
HIV/AIDS
Hypercalcemia
Hyperglycemia
Hypervitaminosis D
Hypothyroidism and sometimes hyperthyroidism
Irritable bowel syndrome
Ketoacidosis
Kidney failure
Low blood pressure
Mania
Metabolic disorders, particularly urea cycle disorders
MELAS syndrome
Nausea
Opioid use disorder
Pancreatitis
Pernicious anemia
Psychosis
Schizophrenia
Side effect of drugs
Stimulant use disorder
Stomach flu
Stress
Sickness behavior
Superior mesenteric artery syndrome
Syndrome of inappropriate antidiuretic hormone secretion
Tuberculosis
Thalassemia
Ulcerative colitis
Uremia
Vitamin B12 deficiency
Zinc deficiency
Infection: Anorexia of infection is part of the acute phase response (APR) to infection. The APR can be triggered by lipopolysaccharides and peptidoglycans from bacterial cell walls, bacterial DNA, and double-stranded viral RNA, and viral glycoproteins, which can trigger production of a variety of proinflammatory cytokines.