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Hyposmia, or microsmia,[1] is a reduced ability to smell and to detect odors. A related condition is anosmia, in which no odors can be detected. Some of the causes of olfaction problems are allergies, nasal polyps, viral infections and head trauma. In 2012 an estimated 9.8 million people aged 40 and older in the United States had hyposmia and an additional 3.4 million had anosmia/severe hyposmia.[2]
Hyposmia might be a very early sign of Parkinson's disease.[3] Hyposmia is also an early and almost universal finding in Alzheimer's disease and dementia with Lewy bodies.[3] Lifelong hyposmia could be caused by Kallmann syndrome[4] or Autism Spectrum Disorder.[5] Along with other chemosensory disturbances, hyposmia can be a key indicator of COVID-19.[6][7]
^Hawkes, Christopher H. (2002). Smell and taste complaints. Boston: Butterworth-Heinemann. pp. 49–50. ISBN 0-7506-7287-0.
^Hoffman, Howard J.; Rawal, Shristi; Li, Chuan-Ming; Duffy, Valerie B. (10 June 2016). "New chemosensory component in the U.S. National Health and Nutrition Examination Survey (NHANES): first-year results for measured olfactory dysfunction". Reviews in Endocrine and Metabolic Disorders. 17 (2): 221–240. doi:10.1007/s11154-016-9364-1. PMC 5033684. PMID 27287364.
^ abFactor, Stewart A., & Weiner, William J., eds. (2008). Parkinson's Disease: Diagnosis and Clinical Management, 2nd ed., pp. 72-73. New York: Demos Medical Publishing.
^Arkoncel, ML; Arkoncel, FR; Lantion-Ang, FL (March 2011). "A case of Kallmann syndrome". BMJ Case Reports. 2011: bcr0120113727. doi:10.1136/bcr.01.2011.3727. PMC 3070321. PMID 22700069. Kallmann syndrome (KS), a rare genetic disorder, refers to the association between hypogonadotropic hypogonadism and anosmia or hyposmia due to abnormal migration of olfactory axons and gonadotropin-releasing hormone producing neurons.
^Lechien JR, Chiesa-Estomba CM, De Siati DR, Horoi M, Le Bon SD, Rodriguez A, et al. (August 2020). "Olfactory and gustatory dysfunctions as a clinical presentation of mild-to-moderate forms of the coronavirus disease (COVID-19): a multicenter European study". European Archives of Oto-Rhino-Laryngology. 277 (8): 2251–2261. doi:10.1007/s00405-020-05965-1. PMC 7134551. PMID 32253535.
^Xydakis MS, Dehgani-Mobaraki P, Holbrook EH, Geisthoff UW, Bauer C, Hautefort C, et al. (September 2020). "Smell and taste dysfunction in patients with COVID-19". The Lancet. Infectious Diseases. 20 (9): 1015–1016. doi:10.1016/S1473-3099(20)30293-0. PMC 7159875. PMID 32304629.
Hyposmia, or microsmia, is a reduced ability to smell and to detect odors. A related condition is anosmia, in which no odors can be detected. Some of the...
or more smells. Anosmia may be temporary or permanent. It differs from hyposmia, which is a decreased sensitivity to some or all smells. Anosmia can be...
remove the olfactory nerves or bulbs. Other olfactory disorders such as hyposmia and anosmia have been found to be a symptom of mood disorders (depression)...
but were later discontinued due to undesirable side effects. Phantosmia Hyposmia Multiple chemical sensitivity, a condition that some believe is caused...
system. It contrasts with the various olfactory disorders, like anosmia, hyposmia, and dysosmia. Förster, G.; Damm, M.; Gudziol, H.; Hummel, T.; Hüttenbrink...
olfactory dysfunction can be total (anosmia), incomplete (partial anosmia, hyposmia, or microsmia), distorted (dysosmia), or can be characterized by spontaneous...
to a lack of stratification, the prevalence of hypogeusia, as well as hyposmia, may not be accurately known. Additionally, reviews do not always make...
but there are no other current treatments except inducing anosmia or hyposmia to the point that the odors are negligible. Phantosmia, perceiving smells...
earliest symptoms are constipation and dizziness from autonomic dysfunction, hyposmia (reduced ability to smell), RBD, anxiety, and depression. RBD may appear...
alterations differ from quantitative alterations, which include anosmia and hyposmia. Dysosmia can be classified as either parosmia (also called troposmia)...
earliest symptoms are constipation and dizziness from autonomic dysfunction, hyposmia (reduced ability to smell), visual hallucinations, and rapid eye movement...
early phases of the cancer, symptoms may include nasal obstruction and hyposmia, as well as other symptoms. More symptoms may develop as malignant cells...
Anosmia – inability to smell Hyperosmia – an abnormally acute sense of smell Hyposmia – decreased ability to smell Presbyosmia – the natural decline in the sense...
Total lack of sense of smell (anosmia) or markedly reduced sense of smell (hyposmia). This is the defining feature of Kallmann syndrome; it is not seen in...
symptoms associated with acute rhinosinusitis include cough, fatigue, hyposmia, anosmia and ear fullness or pressure. Sinus infections can also cause...
affected by the syndrome Nystagmus (involuntary eye movements), seizures, or hyposmia (reduced ability to smell) has been documented in a few patients In 2004...
reflux are affected in both types, with the sense of smell and taste (hyposmia/anosmia and dysgeusia) also being affected in total laryngectomies (a complaint...
hypogonadism associated in a varying percentage of cases with anosmia or hyposmia; cleft palate and other craniofacial defects; and scoliosis and other musculoskeletal...
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