Prof. Dr. Ahmet Özdoğan
ENT — General

Post-COVID Anosmia

Post-COVID anosmia results from damage to sustentacular support cells of the olfactory epithelium following SARS-CoV-2 infection; 10–15% of patients experience persistent loss beyond 6 months.

For Post-COVID Anosmia, the general ENT context connects the reported complaint with objective findings and a safe review frame. Post-COVID anosmia results from damage to sustentacular support cells of the olfactory epithelium following SARS-CoV-2 infection; 10–15% of patients experience persistent loss beyond 6 months. Previous care response, daily functional effect and associated risks make the finding more precise. this entry assessment brings nasal-sinus symptoms, the clinical point throat-tonsil context, the dictionary entry upper-airway impact and this topic sleep links into one ENT frame. The entry strengthens preparation for consultation rather than deciding care. A clinical view of this term interprets anatomical or symptom definitions together with daily-life impact: SARS-CoV-2 damages the olfactory epithelium not through direct neuron infection but via sustentacular support cells, which have high ACE2 receptor expression. This keeps repeat testing burden and delayed diagnosis risk in the same frame.

The first step in the finding assessment is placing the complaint on a timeline. Onset, progression, side, comorbidities and response to previous care are documented separately. this entry review may combine ENT examination, this entry endoscopic assessment, the clinical point oral cavity-oropharynx inspection and the dictionary entry audiological testing when useful. this topic decisions record fever, this term pain-bleeding pattern, the finding hearing or nasal blockage, this entry sleep impact and the clinical point infection recurrence separately. The examination plan for the dictionary entry is built around duration, side, progression and associated risks rather than one symptom alone: MRI-detectable reduction in olfactory bulb volume has been demonstrated in persistent anosmia. Previous reports can therefore improve decision quality. Additional tests matter only when they answer the clinical question that remains after examination.

Management of this topic aims for more than quick symptom relief; it protects durable function and safety. Medication, rehabilitation, procedures and the clinical point surgery are compared within the same risk-benefit frame. the dictionary entry planning discusses medical treatment, this topic allergy control, this term endoscopic procedures, the finding adenoid-tonsil strategy or this entry airway surgery by indication. Management of the clinical point aims to improve quality of life while protecting breathing, the dictionary entry safety, hearing, swallowing and oncologic risk separately. Decisions may be delayed when expectations and objective findings do not align.

this topic review tracks more than symptom score; daily function, safety boundaries and treatment response are read together. this term follow-up compares pain, the dictionary entry nasal openness, this topic sleep quality, this term hearing impact and the finding infection recurrence over time. For this entry, patients learn which findings can be expected and which changes are linked to reassessment. Rising uncertainty can bring the the clinical point appointment forward.

A the dictionary entry file is clearer when warning signs, mild but persistent symptoms and treatment expectations are separated; the personal conclusion still depends on examination.

Before the next reading, this topic context: side pattern and daily-life effect are kept together; appointment time is used with less friction.

During preparation, this term context: safety notes are separated from expected recovery; appointment time is used with less friction.

In the consultation note, the finding context: safety notes are separated from expected recovery; appointment time is used with less friction.

Before the next reading, this topic context: safety notes are separated from expected recovery; appointment time is used with less friction; For terminology clarity, post-covid history, anosmia assessment, post-covid review work as short review notes.

Diagnosis

Sniffin' Sticks TDI score (Threshold + Discrimination + Identification): normal >30.3, hyposmia 16.5–30.3, anosmia <16.5. The UPSIT 40-item standardised test uses a normal threshold of ≥34/40. MRI to assess olfactory bulb volume is recommended in persistent cases. Newly emerged parosmia and phantosmia (perceiving odours that are not present) following COVID-19 should be included in the assessment.

Treatment

Olfactory training is the first-line treatment: rose, eucalyptus, lemon and clove essential oils are sniffed consciously for 30 seconds twice daily for ≥12 weeks. Systemic corticosteroid evidence in post-COVID anosmia is limited and is not routinely recommended. Omega-3 fatty acids 600 mg/day are under investigation as an adjunct. Intranasal PRP is experimental and requires randomised controlled trial evidence.

Outcomes and Follow-up

85% of patients recover within 6 months, with the fastest improvement in the first 2 months. Loss persisting beyond 12 months is a marker of poor prognosis. Olfactory training improves objective outcomes by 28% compared with 6% spontaneous recovery at 12 weeks. Anosmia-related depression may warrant psychiatric evaluation. ENT follow-up should be arranged if there is no improvement at 3 months.

When to Seek Care

Complete smell loss persisting ≥2 weeks after COVID-19 is an indication for ENT assessment. Parosmia disrupting nutrition, depression secondary to anosmia, and no improvement after 3 months of olfactory training are referral criteria. When trauma or a neurological cause is suspected (e.g. fall history, concurrent neurological symptoms), MRI and neurology consultation should be arranged.

Frequently asked questions

What is Post-COVID Anosmia?
Post-COVID anosmia results from damage to sustentacular support cells of the olfactory epithelium following SARS-CoV-2 infection; 10–15% of patients experience persistent loss beyond 6 months. For Post-COVID Anosmia, the general ENT context connects the reported complaint with objective findings and a safe review frame.
When is Post-COVID Anosmia clinically important?
The first step in the finding assessment is placing the complaint on a timeline. It is assessed together with examination, endoscopy or imaging in nasal, throat, sinus and upper-airway complaints.
When is ENT assessment relevant for Post-COVID Anosmia?
ENT assessment becomes relevant if symptoms last more than a few weeks, become one-sided or progressive, or are accompanied by breathing, swallowing, voice, hearing or neck-mass findings.
What information helps assessment of Post-COVID Anosmia?
It is useful to note when symptoms started, which side is affected, previous operations or treatments, current medication, imaging and test reports, and the effect on daily life. It is assessed together with examination, endoscopy or imaging in nasal, throat, sinus and upper-airway complaints.

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References

This glossary entry is for informational purposes only and does not constitute medical advice. Consult a qualified specialist for diagnosis and treatment.

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