Post-COVID Smell Loss: Why Food and Everyday Scents May Feel Different
The review also noted that direct destruction of smell nerve cells themselves may not be the primary mechanism in most patients. Instead, inflammatory changes and disruption of the surrounding cellular environment are thought to play important roles.
UPDATED ON JUNE 8, 2026 • REVIEWED BY DR. DENNIS CHUA
Key Takeaways
- Post-COVID smell loss may persist for weeks or months after infection
- Some individuals recover quickly, while others experience longer-lasting smell changes
- Unlike a typical cold, COVID-19-related smell loss may occur even when the nose does not feel blocked.
- Familiar scents such as coffee or fried foods may smell unpleasant or unusual during the recovery process.
- Recovery timelines vary between individuals. Some people improve gradually over time, while others may continue to notice fluctuating smell function.
During the COVID-19 pandemic, many people in Singapore became familiar with the sudden loss of smell as a possible sign of infection. While some recovered within a short period, others continued to experience lingering smell disturbances long after the acute illness had passed. For some individuals, smells gradually returned over time. Others noticed distorted smells, reduced enjoyment of food, or difficulty detecting familiar everyday scents.
Even as the pandemic evolved and newer variants emerged, post-viral smell dysfunction continued to affect some patients. Research into post-COVID smell loss has expanded considerably over the past few years, helping doctors better understand how these symptoms develop and why recovery experiences may differ between individuals.
For some individuals, smells gradually returned over time. Others noticed distorted smells, reduced enjoyment of food, or difficulty detecting familiar everyday scents. Even as the pandemic evolved and newer variants emerged, post-viral smell dysfunction continued to affect some patients. Research into post-COVID smell loss has expanded considerably over the past few years, helping doctors better understand how these symptoms develop and why recovery experiences may differ between individuals.
How the Sense of Smell Works
The sense of smell depends on specialised nerve cells located high inside the nasal cavity, in an area known as the olfactory epithelium. These cells detect odour molecules and send signals to the brain, where smells are recognised and interpreted.
Smell also contributes significantly to flavour perception. Many people who experience smell loss after COVID-19 describe food as tasting bland, muted, or “different,” even though their ability to detect basic tastes such as sweet, salty, sour, and bitter may still remain intact.
When this smell pathway becomes disrupted, patients may experience:
- Anosmia — complete loss of smell
- Hyposmia — reduced sense of smell
- Parosmia — distorted smell perception
- Phantosmia — smelling odours that are not actually present
Why COVID-19 Affected Smell Differently
Unlike the common cold, where smell loss is often caused mainly by nasal blockage, COVID-19 drew attention because some patients developed sudden smell loss even without significant congestion or a runny nose.
According to a review published in Nature Cell Discovery, researchers believe COVID-19-related smell dysfunction is linked largely to inflammation affecting the olfactory system inside the nose. The virus appears to affect supporting cells surrounding smell receptors, disrupting normal smell signalling.
The review also noted that direct destruction of smell nerve cells themselves may not be the primary mechanism in most patients. Instead, inflammatory changes and disruption of the surrounding cellular environment are thought to play important roles.
What Post-COVID Smell Recovery May Feel Like
Recovery from post-viral smell dysfunction is often gradual and variable.
Some individuals notice a slow return of familiar scents over weeks or months. Others experience fluctuations, where smell function seems better on some days and reduced on others.
One particularly distressing symptom is parosmia, where smells become distorted during recovery.
Patients commonly describe:
- Coffee smelling burnt
- Fried foods smelling unpleasant
- Garlic or onions smelling chemical-like
- Familiar cooking aromas seeming “wrong”
In Singapore, where food and shared meals are closely tied to daily life and social interaction, these changes can affect appetite and enjoyment of meals. Some individuals may report reduced interest in food, while others may become anxious about whether food is spoiled because smells are difficult to interpret accurately.
According to information published by University College London Hospitals (UCLH), distorted smells are commonly reported during recovery from post-COVID smell dysfunction, although the pattern and severity can vary between individuals.
Why Smell Recovery Differs Between Individuals
Recovery patterns can vary considerably.
Factors that may influence recovery include:
- Severity of the initial smell loss
- Degree of inflammation
- Presence of other nasal conditions
- Age
- General health factors
However, predicting exactly how long recovery may take for any individual remains difficult.
A 2024 review published in the medical journal Current Otorhinolaryngology Reports notes many patients report improvement in their sense of smell within about 6 months after COVID-19 infection. However, formal smell testing shows that some individuals may still have lingering smell problems even if they feel mostly recovered. Research has also found that smell recovery can continue gradually for up to 2 years after infection.
“Smell recovery after viral infections can vary widely between individuals. Some patients improve gradually over time, while others may experience distorted smells during the recovery process”
– Dr. Dennis Chua
Importantly, not all persistent smell symptoms after COVID-19 are caused solely by the previous infection itself.
In Singapore, conditions such as allergic rhinitis and chronic sinus inflammation are also common and may contribute to ongoing smell disturbances. Structural problems inside the nose, including nasal polyps, may sometimes coexist with post-viral symptoms.
Can Smell Training Help in Post-COVID Smell Recovery?
One of the more commonly discussed approaches for post-viral smell dysfunction is smell training.
Smell training involves repeatedly exposing the nose to a set of familiar scents over time. Common examples include:
- Rose
- Lemon
- Clove
- Eucalyptus
The process is generally performed consistently over weeks or months.
Are There Medical Treatments?
Management of persistent smell dysfunction depends on the individual’s symptoms and underlying findings.
In selected cases, doctors may consider treatments aimed at reducing nasal inflammation, particularly if other nasal conditions are present. At present, there is no single treatment that guarantees recovery for every patient. Because smell disturbances may arise from different contributing factors, assessment is usually individualised.
When Should Persistent Smell Loss Be Assessed?
Some individuals recover their sense of smell gradually without further intervention. However, medical assessment may be helpful if symptoms:
- Persist for an extended period
- Significantly affect eating or quality of life
- Are associated with nasal blockage or recurrent sinus symptoms
- Include persistent distorted smells
- Affect safety, such as difficulty detecting smoke, gas leaks, or spoiled food
Assessment of smell dysfunction may include:
- Review of symptoms and medical history
- Examination of the nasal passages
- Evaluation for sinus inflammation or nasal polyps
- Consideration of other contributing conditions
Some patients also seek evaluation only later, after adapting to symptoms for months before realising the impact on daily life.
Looking Ahead
Research into post-viral smell dysfunction continues to evolve. Studies are exploring how inflammation affects smell pathways, how smell nerves recover, and why some individuals experience prolonged symptoms while others recover more quickly.
Although recovery experiences vary, increasing understanding of post-viral smell disorders has helped improve recognition of these symptoms and the challenges they may create for patients.
For many individuals, gradual improvement remains possible over time, even if recovery does not occur immediately.
To learn more about smell issues related to COVID-19, book an appointment with Dr Dennis Chua.
Frequently Asked Questions About Post-COVID Smell Loss
How long can post-COVID smell loss last?
Recovery varies between individuals. Some people notice improvement within weeks, while others may continue to experience reduced or distorted smell for several months. Patients may gradually improve over time, although some may continue to have persistent symptoms on formal smell testing.
Why do familiar foods or smells seem unpleasant after COVID-19?
Some individuals develop a condition called parosmia, where smells become distorted during recovery. Common examples include coffee smelling burnt or fried foods smelling unusually unpleasant.
Can smell training help with post-COVID smell loss?
Smell training is one of the commonly discussed approaches for persistent post-viral smell dysfunction. It involves regularly exposing the nose to familiar scents such as rose, lemon, clove, or eucalyptus over time. Smell training may support recovery in some individuals, although responses can vary.
When should persistent smell loss be medically assessed?
Medical assessment may be helpful if smell changes:
- Persist for an extended period
- Affect appetite or quality of life
- Are associated with nasal blockage or sinus symptoms
- Include persistent distorted smells
- Create safety concerns, such as difficulty detecting smoke, gas leaks, or spoiled food
Not all smell loss after COVID-19 is caused solely by the previous infection, and assessment may help identify other contributing nasal or sinus conditions.
If you have questions or concerns about your ears, nose, and throat,
you may book a consultation with Dr Dennis Chua, an ENT specialist in Singapore.
He has completed his training in otorhinolaryngology locally and attained qualifications internationally.
About Dr Dennis Chua
Dr. Dennis Chua is an Ear, Nose and Throat (ENT) specialist with more than a decade of experience. He is held in high regard within the field of Otolaryngology, having published many articles in peer reviewed journals on the topic of ENT.
As an ENT Specialist in Singapore, Dr Dennis Chua is committed to providing thorough, patient-centred care for both adults and children. Whether you’re managing allergies, sinus problems, hearing issues, or throat concerns, we take time to understand your condition and guide you through your treatment options.
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