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Anosmia (pronounced //) is [[an olfaction disorder and is the inability to perceive odor, or in other words a lack of functioning olfaction. Anosmia may be temporary but traumatic anosmia can be permanent. Anosmia is due to an inflammation of the nasal mucosa; blockage of nasal passages or a destruction of one temporal lobe. Specifically, according to The Lancet journal, inflammation is due to chronic mucosa changes in the paranasal sinus lining and the middle and superior turbinates. Since anosmia causes inflammatory changes in the nasal passage ways, it is treated by simply reducing the presence of inflammation. It can be caused by chronic meningitis and neurosyphilis that would increase intracranial pressure over a long period of time, and in some cases by ciliopathy including ciliopathy due to primary ciliary dyskinesia (Kartagener syndrome, Afzelius’ syndrome or Siewert’s syndrome). Many patients may experience unilateral anosmia, often as a result of minor head trauma. This type of anosmia is normally only detected if both of the nostrils are tested separately. Using this method of testing each nostril separately will often show a reduced or even completely absent sense of smell in either one nostril or both, something which is often not revealed if both nostrils are simultaneously tested.
A related term, hyposmia, refers to a decreased ability to smell, while hyperosmia refers to an increased ability to smell. Some people may be anosmic for one particular odor. This is known as "specific anosmia". The absence of the sense of smell from birth is called Congenital Anosmia.
Anosmia can be diagnosed by doctors by using acetylcysteine tests. Doctors will begin with a detailed elicitation of history. Then the doctor will ask for any related injuries in relation to anosmia which could include upper respiratory infections or head injury. Psychophysical Assessment of order and taste identification can be used to identity anosmia. A nervous system examination is performed to see if the cranial nerves are damaged. The diagnosis as well as the degree of impairment can now be tested much more efficiently and effectively than ever before thanks to "smell testing kits" that have been made available as well as screening tests which use materials that most clinics would readily have. Occasionally, after accidents, there is a change in a patient's sense of smell. Particular smells that were present before are no longer present. On occasion, after head traumas, there are patients who have unilateral anosmia. The sense of smell should be tested individually in each nostril.
Many cases of congenital anosmia remain unreported and undiagnosed. Since the disorder is present from birth the individual may have little or no understanding of the sense of smell, hence are unaware of the deficit. It may also lead to reduction of appetite 
According to a research article, there have been many cases where MRI scans have resulted in anxiety and panic in patients, due to various reasons but mainly claustrophobia. However, these experiences were of random nature.
Anosmia can have a number of harmful effects. Patients with sudden onset anosmia may find food less appetizing, though congenital anosmics rarely complain about this, and none report a loss in weight. Loss of smell can also be dangerous because it hinders the detection of gas leaks, fire, and spoiled food. The common view of anosmia as trivial can make it more difficult for a patient to receive the same types of medical aid as someone who has lost other senses, such as hearing or sight.
Losing an established and sentimental smell memory (e.g. the smell of grass, of the grandparents' attic, of a particular book, of loved ones, or of oneself) has been known to cause feelings of depression.
Often people who have congenital anosmia report that they pretended to be able to smell as children because they thought that smelling was something that older/mature people could do, or did not understand the concept of smelling but did not want to appear different from others. When children get older, they often realize and report to their parents that they do not actually possess a sense of smell, often to the surprise of their parents.
A study done on patients suffering from anosmia found that when testing both nostrils, there was no anosmia revealed, however when testing each nostril individually, tests showed that the sense of smell was usually affected in only one of the nostrils as opposed to both. This demonstrated that unilateral anosmia is not uncommon in anosmia patients. 
A temporary loss of smell can be caused by a blocked nose or infection. In contrast, a permanent loss of smell may be caused by death of olfactory receptor neurons in the nose or by brain injury in which there is damage to the olfactory nerve or damage to brain areas that process smell (see olfactory system). The lack of the sense of smell at birth, usually due to genetic factors, is referred to as congenital anosmia. Family members of the patient suffering from congenital anosmia are often found with similar histories; this suggests that the anosmia may follow an autosomal dominant pattern. Anosmia may very occasionally be an early sign of a degenerative brain disease such as Parkinson's disease and Alzheimer's disease. Another specific cause of permanent loss could be from damage to olfactory receptor neurons because of use of certain types of nasal spray; i.e., those that cause vasoconstriction of the nasal microcirculation. To avoid such damage and the subsequent risk of loss of smell, vasoconstricting nasal sprays should be used only when absolutely necessary and then for only a short amount of time. Non-vasoconstricting sprays, such as those used to treat allergy-related congestion, are safe to use for prescribed periods of time. Anosmia can also be caused by nasal polyps. These polyps are found in people with allergies, histories of sinusitis & family history. Individuals with cystic fibrosis often develop nasal polyps.
Amiodarone is a drug used in the treatment of arrhythmias of the heart. A clinical study performed demonstrated that the use of this drug induced anosmia in some patients. Although rare, there was a case in which a 66-year-old male was treated with Amiodarone for ventricular tachycardia. After the use of the drug he began experiencing olfactory disturbance, however after decreasing the dosage of Amiodarone, the severity of the anosmia decreased accordingly hence correlating the use of Amiodarone to the development of anosmia.
Causes of anosmia include:
- Upper respiratory tract infection (e.g., sinusitis or the common cold)
- Nasal polyps
- Idiopathic hypogonadotropic hypogonadism
- Head trauma, damage to the ethmoid bone
- Dementia with Lewy bodies
- Tumors of the frontal lobe
- Parkinson's disease
- Alzheimer's disease
- Toxins (especially acrylates, methacrylates and cadmium)
- Old age
- Kallmann syndrome
- Primary ciliary dyskinesia
- Post-perfusion syndrome
- Laryngectomy with permanent tracheostomy
- Esthesioneuroblastoma is an exceedingly rare cancerous tumor that originates in or near the olfactory nerve. Symptoms are anosmia (loss of sense of smell) often accompanied by chronic sinusitis.
- Intranasal drug use
- Samter's triad
- Foster Kennedy syndrome
- Cadmium poisoning
- Neurotropic virus
- Pernicious anemia
- Zinc deficiency
- Bell's Palsy or nerve paralysis and damage
- Idiopathic intracranial hypertension
- Suprasellar meningioma
- Refsum's disease
- Adrenergic agonists or withdrawal from alpha blockers (vasoconstriction)
- Zinc-based intranasal cold products
- Chronic atrophic rhinitis
- Paget's disease of bone
- Cerebral aneurysm
- Wegener's Granulomatosis
- Primary amoebic meningoencephalitis
- Myasthenia gravis
Though anosmia caused by brain damage cannot be treated, anosmia caused by inflammatory changes in the mucosa may be treated with glucocorticoids. Reduction of inflammation through the use of oral glucocorticoids such as prednisone, followed by long term topical glucocorticoid nasal spray, would easily and safely treat the anosmia. A prednisone regimen is adjusted based on the degree of the thickness of mucosa, the discharge of oedema and the presence or absence of nasal polyps. However, the treatment is not permanent and may have to be repeated after a short while. Together with medication, pressure of the upper area of the nose must be mitigated through aeration and drainage.
There have also been cases where the use of acupuncture have successfully treated anosmia.
Although very early in development, gene therapy has restored a sense of smell in mice with congenital anosmia when caused by ciliopathy. In this case a genetic condition had affected cilia in their bodies which normally enabled them to detect air-borne chemicals, and an adenovirus was used to implant a working version of the IFT88 gene into defective cells in the nose, which restored the cilia and allowed a sense of smell.
On June 16, 2009, the U.S. Food and Drug Administration sent a warning letter to Matrixx Initiatives, manufacturer of an over-the-counter nasal spray for the common cold, Zicam. The FDA cited complaints that the product caused anosmia. The manufacturer strongly denies these allegations, but has recalled the product and has stopped selling it.
In fact, Matrixx has received more than 800 reports of Zicam users who were losing their sense of smell but did not provide those reports to the F.D.A due to this product produced.
- Kallmann syndrome
- Zinc deficiency
- Cadmium Poisoning
- Primary amoebic meningoencephalitis caused by Naegleria fowleri
- Refsum disease
- CHARGE syndrome
- ↑ Knight, Allan, "Anosmia", The Lancet, August 27, 1988
- ↑ includeonly>The Lancet. "ANOSMIA", January 1943.
- ↑ Impact of Defective Cilia
- ↑ PMID 21475513 (PMID 21475513 &query_hl=14&itool=pubmed_docsum 21475513 )
- ↑ Harvey, Peter. "Anosmia". Practical Neurology, 206, p. 65
- ↑ Anosmia / Loss Of Smell.
- ↑ (2003). Anosmia: Diagnosis and management. Current Opinion in Otolaryngology & Head and Neck Surgery 11: 54–60.
- ↑ Harvey, Peter. "Anosmia". Practical Neurology, 206, p.65.
- ↑ Vowels, R.H., Bleach, N. R., Rowe-Jones, J. M. (1997). Congenital anosmia. 41: 207-214.
- ↑ Summer, D. W. Appetite and Anosia. The Lancet (1971), 297 (7706), pg. 970-970.
- ↑ Knight, Allan, "Anosmia", The Lancet, August 27, 1988.
- ↑ my.access — University of Toronto Libraries Portal
- ↑ 13.0 13.1 13.2 includeonly>"Sense and scent ability", BBC News, December 27, 2006. Retrieved on April 25, 2010.
- ↑ Harvey,P. (2006). Anosmia. Practical Neurology. 6:64-65. Retrieved from: http://pn.bmj.com.myaccess.library.utoronto.ca/content/6/1/65.full.pdf+html
- ↑ Waguespack, R. (1992). Congenital Anosmia. Arch Otolargyngol Head Neck Surg. 118(1): 10.
- ↑ Preventing Anosmia from Intranasal Zinc Administration
- ↑ Maruyama T. Yasuda S. Odashiro K. Kaji Y. Harada M. (2007). Anosmia Induced by Amiodarone. The American Journal of Medicine. 120 (11). Retrieved from: http://journals1.scholarsportal.info.myaccess.library.utoronto.ca/tmp/8327703549542877532.pdf
- ↑ (2001). Olfaction and Its Alteration by Nasal Obstruction, Rhinitis, and Rhinosinusitis. The Laryngoscope 111 (3): 409–23.
- ↑ (1997). Olfactory Dysfunction in Patients with Head Trauma. Archives of Neurology 54 (9): 1131–40.
- ↑ (1988). Olfactory dysfunction in parkinsonism: A general deficit unrelated to neurologic signs, disease stage, or disease duration. Neurology 38 (8): 1237–44.
- ↑ (1999). Loss of Olfactory Function in Dementing Disease. Physiology & Behavior 66 (2): 177–82.
- ↑ (1989). Olfactory function in chemical workers exposed to acrylate and methacrylate vapors. American Journal of Public Health 79 (5): 613–8.
- ↑ (1992). Olfactory impairment after chronic occupational cadmium exposure. Journal of occupational medicine 34 (6): 600–5.
- ↑ (1998). Olfactory disorders induced by cadmium exposure: A clinical study. International journal of occupational medicine and environmental health 11 (3): 235–45.
- ↑ (1984). Smell identification ability: Changes with age. Science 226 (4681): 1441–3.
- ↑ Esthesioneuroblastoma. eMedicine.
- ↑ (2009). Treatment of Postviral Olfactory Loss with Glucocorticoids, Ginkgo biloba, and Mometasone Nasal Spray. Archives of Otolaryngology - Head and Neck Surgery 135 (10): 1000–4.
- ↑ (2005). Olfactory functions and volumetric measures of orbitofrontal and limbic regions in schizophrenia. Schizophrenia Research 74 (2–3): 149–61.
- ↑ (1997). Isolated neurosarcoidosis presenting as anosmia and visual changes. Otolaryngology - Head and Neck Surgery 117 (6): S183–6.
- ↑ (1995). Dental, visual, auditory and olfactory complications in Paget's disease of bone. Journal of the American Geriatrics Society 43 (12): 1384–91.
- ↑ Anosmia following operation for cerebral aneurys... [J Neurosurg. 1990] - PubMed - NCBI
- ↑ Leon-Sarmiento FE, Bayona EA, Bayona-Prieto J, Osman A, Doty RL (October 2012). Profound Olfactory Dysfunction in Myasthenia Gravis. PLoS ONE.
- ↑ Knight, A. (1998). Anosmia. The Lancet, 332(8609),512. doi: 10.1016/S0140-6736(88)90160-2
- ↑ Knight A (1988). Anosmia. The Lancet 332 (8609).
- ↑ Turnley W. M. H. (1963). Anosmia. The Laryngoscope 73 (4): 468–473.
- ↑ Michael W (2003). Anosmia treated with acupuncture. Acupuncture in Medicine 21 (4).
- ↑ Gene therapy rescues cilia defects and restores olfactory function in a mammalian ciliopathy model
- ↑ BBC News
- ↑ includeonly>"FDA warns against using 3 popular Zicam cold meds - CNN.com", CNN, June 16, 2009. Retrieved on April 25, 2010.
- ↑ title=F.D.A. Warns Against Use of Popular Cold Remedy
- Blodgett, Bonnie (2010). Remembering Smell: A Memoir of Losing - and Discovering - the Primal Sense, Houghton Mifflin Harcourt.
- Tafalla, Marta (2010). Nunca sabrás a qué huele Bagdad (You will never know the smell of Bagdad) (in Spanish), Autonomous University of Barcelona. - Novel dealing with congenital anosmia.
Symptoms and signs: cognition, perception, emotional state and behaviour (R40-R46, 780.0-780.5,781.1)
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