How COVID-19 can affect taste
COVID-19 can alter or reduce your sense of taste, but it usually does so indirectly by affecting smell, since the flavor of food depends heavily on odor signals to the brain. True taste loss (ageusia) is less common than a reduced or distorted sense of taste (dysgeusia) or reduced ability to detect certain tastes like sweet or bitter. Most people with COVID-19 who experience taste changes also have smell dysfunction, and these symptoms often appear early in infection alongside fatigue, fever, or sore throat. Taste and smell loss in COVID-19 are typically acute and temporary, though recovery can take weeks to months.
Why COVID-19 causes taste and smell changes
SARS-CoV-2 can trigger inflammation and alter the function of cells in the nose and taste pathways, including support cells and olfactory sensory neurons. Although the virus can infect certain taste and smell cells in laboratory settings, the main clinical picture is a loss of smell (anosmia) that reduces flavor perception, which people may describe as a loss of taste. Because flavor is a combination of taste, smell, and other senses, isolating whether the issue is primarily taste versus smell helps clinicians and clinicians distinguish COVID-19-related changes from other causes.
Key mechanisms in brief
- Inflammation and swelling in nasal passages reduce odor delivery to smell receptors.
- Support cells (sustentacular cells) in the olfactory epithelium show high expression of proteins the virus can use to enter cells, which may explain smell loss.
- Direct infection of taste cells is possible but less central to the clinical picture in most people.
How common is taste loss in COVID-19?
Loss of smell and taste is a common early symptom of COVID-19 and can occur with any variant, though frequency varies by age, vaccination status, and prior immune exposures. Studies from earlier in the pandemic reported a wide range for smell loss, often affecting a large majority of infected people at some point, while taste loss is somewhat less frequent but still highly reported. The table below summarizes typical ranges reported in pooled analyses and large studies up to 2023.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Reported prevalence of smell loss (anosmia) | 40–98% across studies; higher in early waves and unvaccinated cohorts | Systematic reviews/meta-analyses |
| Reported prevalence of taste loss (ageusia or dysgeusia) | 20–60%, often overlapping with smell dysfunction | Clinical cohorts and surveys |
| Typical time to onset | Often within days of infection; can be first or early symptom | Observational studies |
| Median duration | 7–14 days for most, but some report weeks to months | Prospective symptom tracking |
| Factors associated with longer recovery | Higher age, lower vaccination status, more severe acute infection, prior episodes | Cohort analyses |
Taste changes versus smell changes in COVID-19
Because flavor is a blend of taste, smell, texture, and trigeminal sensations, COVID-19–related flavor loss is commonly driven by smell loss rather than pure taste loss. Understanding the difference can help you describe symptoms accurately to a clinician and set realistic expectations for recovery.
Quick comparison
- True taste (sweet, salty, sour, bitter, umami): Often largely preserved; issues usually point to other causes.
- Smell (olfactory function): Frequently reduced or absent early in COVID-19, driving much of the perceived flavor loss.
- Flavor (combined perception): Heavily reduced when smell is impaired, even if taste is intact.
- Dysgeusia (distorted taste): Reports of unpleasant or metallic tastes, sometimes lasting beyond acute infection.
Recovery timeline and what to expect
For most people, taste and smell improve gradually within days to weeks after other acute symptoms begin. A median recovery time of about 7–14 days is commonly reported, but a subset of people experience symptoms for longer. Factors linked to longer recovery include older age, lower vaccination levels, more severe initial illness, and repeated infections. If symptoms persist beyond a few weeks, clinicians can evaluate for other contributors and provide supportive strategies.
Supportive measures while recovering
- Focus on food safety and nutrition: prioritize nutrient-dense options even if flavors are muted.
- Use texture, temperature, and aroma cues to make meals more appealing.
- Avoid excessive salt or sugar to reduce reliance on strong taste signals.
- Practice smell training with familiar, pleasant odors (e.g., lemon, rose, clove, eucalyptus) to potentially support olfactory recovery.
- Address stress and sleep, which can influence perception of taste and smell.
When to seek medical care
Contact a healthcare provider if taste or smell loss is severe, worsening, or accompanied by new neurological symptoms such as confusion, persistent headache, or weakness. You should also seek care if symptoms last beyond a few weeks, if you are unable to maintain adequate nutrition or hydration, or if you have concerns about medication side effects or other medical conditions. A clinician can assess whether additional causes—such as other infections, medications, dental issues, or sinus disease—are contributing and can offer tailored advice.
Other common questions
Because COVID-19 remains widely circulating and reinfections are common, many people continue to wonder how taste and smell changes relate to ongoing variants and vaccines. Current evidence indicates that vaccination and prior infection can modify the risk and duration of sensory changes, generally making them less severe and shorter-lived. Ongoing research continues to clarify how newer variants, vaccination patterns, and population immunity affect the likelihood and duration of taste and smell loss. If you are experiencing persistent changes, tracking symptoms over time and discussing them with a clinician can help identify treatable contributors.
Bottom line
COVID-19 commonly causes reductions in smell that can feel like a loss of taste, but true taste loss is less frequent. Most people see gradual improvement within days to weeks, although some experience longer symptoms. Understanding the role of smell versus taste, using practical supportive strategies, and seeking clinical guidance when needed can help you manage symptoms and support recovery.