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Decreased olfactory sensitivity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



reduction of the sense of smell. Hyposmia may be effective for all odors or for just some, and it may be two-sided or one-sided. Hyposmia occurs with the impairment of nasal breathing, acute or chronic inflammations of the mucous membranes of the nasal cavity (due to the common cold), diseases of the peripheral part of the olfactory nerve, and afflictions of the olfactory center. Diagnosis is made by means of elementary odor tests or an olfactometer, a device that measures the keenness of the sense of smell. Therapy is ordinarily directed to elimination of the factor that has caused the hyposmia.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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So while some of the previously mentioned causes of anosmia or hyposmia can also affect taste, factors such as age, smoking, certain medications and cancer treatment can also affect your taste buds, either by reducing your sense of taste or by causing an unpleasant taste to linger in your mouth.
In our study, all the 50 patients (100%) had complaints of nasal obstruction followed by nasal discharge in 30 patients (60%), hyposmia in 14 patients (28%), postnasal discharge in 10 patients (20%), headache in 6 patients (12%) and sneezing in 5 patients (10%).
rs11931074 was proved to be strongly associated with PD risk, and there were studies reporting its specific clinical features such as hyposmia and RBD as stated above [12-14].
GNRHR defects produce AR, isolated nIHH, with no evidence of accompanying developmental defects such as hyposmia (65,66,67).
Sinonasal undifferentiated carcinoma from a 59-year-old woman who presented with a history of left-sided nasal obstruction and hyposmia. Computerized tomography scan revealed a left-sided nasopharyngeal mass, extending to the lateral nasal wall (A, arrow).
Based on the aforementioned history, physical examination, radiographic evaluation, and biochemical data indicative of hypogonadotropic hypogonadism with hyposmia, the patient was diagnosed with Kallmann syndrome with severe osteoporosis due to hypogonadism.
Associated symptoms include rhinorrhea, hyposmia, frontal headache, facial pain, proptosis, diplopia, and epiphora [13].
The clinical diagnosis of sinusitis is generally characterized by the following symptoms [7]: facial pain, facial pressure, facial congestion, nasal congestion, nasal obstruction, nasal discharge, purulence or discolored postnasal drainage, hyposmia or anosmia, fever, purulence on intranasal examination, headache, halitosis, fatigue, dental pain, cough, ear pain, and ear pressure.
Hyposmia is a frequent symptom in neurodegenerative diseases, such as Alzheimer's disease (AD) [1], and synucleinopathies, including Parkinson's disease (PD), Parkinson's disease dementia (PDD), and dementia with Lewy bodies (DLB) [2].
Neurological complaints, such as mild mental or motor dysfunction, vertigo, epileptic attack, hyposmia, were present in a much lower degree (from 2.3 to 9.3% of patients) in addition to oculomotor paresis with subjective complaints of diplopia and proptosis.
Olfactory disorders (OD) are generally dichotomized in qualitative (parosmia, phantosmia, olfactory agnosia) and quantitative olfactory disorders (QODs: hyposmia, anosmia, hyperosmia).
Three of our patients were asymptomatic and two presented with a headache and hyposmia. CT scan showed ground glass opacity of inferior turbinate.