Anorexia (symptom)
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| Anorexia | |
|---|---|
| Specialty | Lua error in package.lua at line 80: module 'Module:GetParameters' not found. |
| Symptoms | Not wanting to eat, no hunger, dizziness, weakness |
| Causes | Achy stomach, gastroparesis, food poisoning |
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Anorexia is a medical term for a loss of appetite. While the term outside of the scientific literature is often used interchangeably with anorexia nervosa, many possible causes exist for a loss of appetite, some of which may be harmless, while others indicate a serious clinical condition or pose a significant risk.
Anorexia in this usage is a symptom, not a diagnosis.
The symptom also occurs in non-human animals, such as cats,[1][2] dogs,[3][4] cattle, goats, and sheep.[5] In these species, anorexia may be referred to as inappetence. As in humans, loss of appetite can be due to a range of diseases and conditions, as well as environmental and psychological factors.[2][4]
Etymology
The term is from Template:Langx (Script error: No such module "Lang"., 'without' + Script error: No such module "Lang"., spelled Script error: No such module "lang"., meaning 'appetite').[6]
Common manifestations
Anorexia simply manifests as a decreased or loss of appetite. This can present as not feeling hungry or lacking the desire to eat.[7] Sometimes people do not even notice they lack an appetite until they begin to lose weight from eating less. In other cases, it can be more noticeable, such as when a person becomes nauseated from just the thought of eating. Any form of decreased appetite that leads to changes in the body (such as weight loss or muscle loss) and is not done intentionally as part of dieting is clinically significant.[8]
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.[8] 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.[8]
Common causes
- Abdominal pain
- Acute radiation syndrome
- ADHD
- Addison's disease
- Alcoholism
- Alcohol withdrawal
- Anemia
- Anorexia nervosa
- Anxiety
- Appendicitis
- Babesiosis
- Benzodiazepine withdrawal
- Bipolar disorder
- Bronchitis
- Cancer[9][10]
- Cannabinoid hyperemesis syndrome
- Cannabis withdrawal
- Celiac disease[11]
- Chronic kidney disease
- Chronic pain
- Common cold
- Constipation
- COPD
- COVID-19
- Crohn's disease
- Cystic fibrosis
- Dehydration
- Dementia
- Depression
- Diabetes
- Ebola
- Fatty liver disease
- Fever
- Food poisoning
- Gastroparesis
- Heart failure
- Hepatitis
- HIV/AIDS
- Hypercalcemia
- Hyperglycemia
- Hypervitaminosis D
- Hypothyroidism and sometimes hyperthyroidism
- Infection
- Influenza
- Irritable bowel syndrome
- Ketoacidosis
- Kidney failure[12]
- Low blood pressure
- Macroglossia
- Mania
- Metabolic disorders, particularly urea cycle disorders
- MELAS syndrome
- Nausea
- Old age
- Opioid use disorder
- Pancreatitis
- Pernicious anemia (vitamin B12 deficiency)
- Pneumonia
- Psychosis
- Salmonellosis
- Schizophrenia
- Side effect of drugs
- Stimulant use disorder
- Stomach flu
- Stress
- Sickness behavior[13][14]
- Superior mesenteric artery syndrome
- Syndrome of inappropriate antidiuretic hormone secretion[15]
- Tobacco smoking
- Tuberculosis
- Thalassemia
- Ulcerative colitis
- Uremia[16]
- Folate deficiency
- Zinc deficiency
Drugs
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- Stimulants, such as ephedrine, amphetamine, methamphetamine, MDMA, cathinone, methylphenidate, cocaine, etc.
- Hormones which are produced by adrenal glands and used as medication such as adrenaline.
- Narcotics, such as heroin, morphine, codeine, hydrocodone, oxycodone, etc.
- Antidepressants may have anorexia as a side effect, primarily selective serotonin reuptake inhibitors (SSRIs) such as fluoxetine.
- Byetta, a type II diabetes drug, will cause moderate nausea and loss of appetite.
- Abruptly stopping appetite-increasing drugs, such as cannabis and corticosteroids.
- Chemicals that are members of the phenethylamine group. (Individuals with anorexia nervosa may seek them to suppress appetite.)
- Topiramate may cause anorexia as a side effect.
- Other drugs may be used to intentionally cause anorexia in order to help a patient preoperative fasting prior to general anesthesia. It is important to avoid food before surgery to mitigate the risk of pulmonary aspiration, which can be fatal.
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).[17]
- Allergy
- Altitude sickness
- Airsickness
- 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
- Toothache
- Experiencing grotesque, unpleasant or unappealing thoughts or conversations
- 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.[8]
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.[18]
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.[18]
Management
Anorexia can be treated with the help of orexigenic drugs.[19][20]
References
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- ^ Page Module:Citation/CS1/styles.css has no content.Chan, Daniel L. (November 1, 2009). "The Inappetent Hospitalised Cat: Clinical Approach to Maximising Nutritional Support". Journal of Feline Medicine and Surgery. 11 (11): 925–933. doi:10.1016/j.jfms.2009.09.013. PMC 11383021. PMID 19857855. S2CID 20998698.
- ^ a b Page Module:Citation/CS1/styles.css has no content."Anorexia". Cornell Feline Health Center. Cornell University. 16 October 2017. Retrieved July 19, 2020.
- ^ Page Module:Citation/CS1/styles.css has no content.Carrozza, Amanda; Marks, Stanley (November 20, 2018). "NY Vet: The Best Approach to Treating Inappetence". American Veterinarian. Archived from the original on July 19, 2020. Retrieved July 19, 2020.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Llera, Ryan; Downing, Robin. "Anorexia in Dogs". VCA Animal Hospital. Archived from the original on July 19, 2020. Retrieved July 19, 2020.
- ^ Page Module:Citation/CS1/styles.css has no content.Jubb, Tristan; Perkins, Nigel. "Inappetence/Inanition". Veterinary Handbook for the Livestock Export Industry. Australian Livestock Export Corporation, Meat & Livestock Australia. Archived from the original on July 19, 2020. Retrieved July 19, 2020.
- ^ Page Module:Citation/CS1/styles.css has no content.Psyhogeos, Matina (14 April 2016). Page Publishing Inc. (ed.). English Words Deriving from the Greek Language. Page Publishing Incorporated. ISBN 978-1682134283.
- ^ Page Module:Citation/CS1/styles.css has no content."Loss of Appetite - Digestive Disorders". Merck Manuals Consumer Version. Retrieved 2021-10-27.
- ^ a b c d Page Module:Citation/CS1/styles.css has no content.Jameson, Larry (2016). Endocrinology: Adult and Pediatric. Philadelphia, PA: Saunders. pp. 506–510. ISBN 978-0-323-18907-1.
- ^ Page Module:Citation/CS1/styles.css has no content."Loss of Appetite". www.cancer.org. Retrieved 2021-10-27.
- ^ Page Module:Citation/CS1/styles.css has no content."Loss of appetite". Canadian Cancer Society. December 2019. Archived from the original on 2021-10-27.
- ^ Page Module:Citation/CS1/styles.css has no content.Taylor AK, Lebwohl B, Snyder CL, Green PH (17 September 2015). "Celiac Disease". GeneReviews®. PMID 20301720. Retrieved 24 September 2017.
- ^ Page Module:Citation/CS1/styles.css has no content."Pinworms in Kids & Adults: Pictures, Symptoms & Treatments Viewer Comments and Reviews: Hypothyroidism - Symptoms - Patients Share Their Knowledge on eMedicineHealth". eMedicineHealth. Archived from the original on 2015-10-04. Retrieved 2017-11-28.
- ^ Page Module:Citation/CS1/styles.css has no content.Exton, M. S. (1997). "Infection-Induced Anorexia: Active Host Defence Strategy". Appetite. 2 (3): 369–383. doi:10.1006/appe.1997.0116. PMID 9468766. S2CID 10465902.
- ^ Page Module:Citation/CS1/styles.css has no content.Murray, M. J.; Murray, A. B. (1979). "Anorexia of infection as a mechanism of host defense". The American Journal of Clinical Nutrition. 32 (3): 593–596. doi:10.1093/ajcn/32.3.593. PMID 283688.
- ^ Page Module:Citation/CS1/styles.css has no content.Winston, Anthony P (March 2012). "The clinical biochemistry of anorexia nervosa". Annals of Clinical Biochemistry: International Journal of Laboratory Medicine. 49 (2): 132–143. doi:10.1258/acb.2011.011185. PMID 22349551. S2CID 207193656.
- ^ Page Module:Citation/CS1/styles.css has no content.Aguilera, A; Selgas, R; Codoceo, R; Bajo, A (November 2000). "Uremic anorexia: a consequence of persistently high brain serotonin levels? The tryptophan/serotonin disorder hypothesis". Peritoneal Dialysis International. 20 (6): 810–6. doi:10.1177/089686080002000648. PMID 11216590. S2CID 1731116.
- ^ Page Module:Citation/CS1/styles.css has no content."Home Care After Tonsillectomy and Adenoidectomy". Archived from the original on July 17, 2011.
- ^ a b Page Module:Citation/CS1/styles.css has no content.Jáuregui-Garrido, B.; Jáuregui-Lobera, I. (2012). "Sudden death in eating disorders". Vascular Health and Risk Management. 8: 91–98. doi:10.2147/VHRM.S28652. PMC 3292410. PMID 22393299.
- ^ Page Module:Citation/CS1/styles.css has no content.Thomas, David R. (February 2006). "Guidelines for the Use of Orexigenic Drugs in Long-Term Care". Nutrition in Clinical Practice. 21 (1): 82–87. doi:10.1177/011542650602100182. ISSN 0884-5336. PMID 16439773.
- ^ Page Module:Citation/CS1/styles.css has no content.Viswambharan, Vishal; Manepalli, Jothika N; Grossberg, George T (February 2013). "Orexigenic agents in geriatric clinical practice". Aging Health. 9 (1): 49–65. doi:10.2217/ahe.12.83. ISSN 1745-509X.
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