Smelling something burning when nothing around you is actually on fire is a real phenomenon, not your imagination. It falls under a category called phantosmia, which means perceiving an odor that isn’t physically present. About 5% of older adults experience phantom smells at some point, and burning is one of the most commonly reported types. The causes range from completely harmless to worth investigating, depending on how often it happens and what other symptoms come with it.
Phantosmia vs. Parosmia
There are two distinct ways your sense of smell can go wrong. Phantosmia is smelling something that isn’t there at all, like detecting smoke in a room where nothing is burning. Parosmia is different: a real smell is present, but your brain misinterprets it. With parosmia, your morning coffee might smell like chemicals, or fresh bread might smell rotten. Both conditions are classified as qualitative disturbances of smell, and both can produce that “something’s burning” sensation.
The distinction matters because the causes and timelines differ. Phantosmia points more toward your brain generating a signal on its own, while parosmia suggests the wiring between your nose and brain has been damaged or disrupted, often by a virus.
Common Causes
Sinus and Upper Respiratory Issues
The most frequent trigger is simple: inflammation in your nasal passages. A cold, sinus infection, or allergies can irritate the olfactory nerve cells lining the upper part of your nose. When those cells misfire, you can perceive odors that aren’t there. These episodes typically resolve on their own as the infection or inflammation clears up.
Post-Viral Smell Distortion
Viral infections, including COVID-19, can damage the smell receptors in your nose. What makes this tricky is the timing. Many people don’t notice the distortion right away. With COVID-19 specifically, parosmia often shows up three to four months after the initial infection. People report everyday things like food or body odor suddenly smelling like garbage, rotten eggs, or chemicals.
Recovery is slow but probable. About 65% of people with COVID-related smell distortion regain normal function by 18 months, and 80 to 90% recover by two years. Other viruses like the common cold and flu can cause the same kind of damage, though it’s been less thoroughly studied.
Migraines
If the burning smell hits you shortly before a headache, it could be an olfactory aura. Migraines are well known for causing visual auras (flashing lights, blind spots), but a small number of migraine sufferers experience smell-based auras instead. The odors reported include burnt wood, smoke, gas, rotten meat, and metallic or sulfur-like smells. This is rare in adults (about 0.1% of migraine patients) but more common in children with migraines, affecting roughly 4%.
Seizure Activity
A sudden, strange smell can be the first sign of a temporal lobe seizure. The temporal lobes sit on either side of your brain, roughly behind your ears, and they process both smell and memory. When a burst of abnormal electrical activity starts in this region, it can produce what’s called an aura: a brief warning signal that includes a sudden unexplained odor or taste. These seizures typically last 30 seconds to 2 minutes and may also cause confusion, a dreamlike feeling, or a brief period where you stop responding to people around you.
Not everyone who smells something burning is having a seizure. But if the smell comes in short, repeating episodes and is accompanied by altered awareness, lip smacking, or involuntary hand movements, that pattern is worth taking seriously.
Tumors
This is what most people are worried about when they search this topic. Rarely, phantom smells can be caused by a brain tumor, particularly a type called an olfactory groove meningioma that grows near the smell-processing areas of the brain. However, specialists at MD Anderson Cancer Center emphasize that statistically, phantosmia is “far, far more likely to be caused by something else.” No one can diagnose a specific condition based on the type of smell alone. A burning rubber smell does not point to any one cause more than another.
When It’s Likely Nothing to Worry About
A one-time episode, or occasional phantom smells during allergy season or while recovering from a cold, is almost always benign. Many people experience a brief whiff of smoke or burning that lasts seconds and never returns. Stress, sleep deprivation, and even certain medications can temporarily scramble smell signals.
The threshold most specialists use: if the phantom smell can’t be explained by a recent cold or respiratory virus and it persists for more than two to three weeks, it’s worth getting checked by an ear, nose, and throat doctor. That’s especially true if it comes with other neurological symptoms like headaches, confusion, vision changes, or episodes of lost awareness.
What Helps
For post-viral smell distortion, the best-studied treatment is smell retraining therapy. The protocol is straightforward: you sniff a set of four distinct odors (commonly rose, lemon, clove, and eucalyptus) for 30 seconds each, twice a day. A study of 153 people with virus-related smell changes found that after six months of this routine, participants improved their overall sense of smell as well as their specific smell disorder. You can do this at home with essential oils or spices.
For phantosmia caused by sinus issues, treating the underlying inflammation with nasal rinses or allergy management often resolves the phantom smells. When seizures or migraines are the cause, treating the underlying condition typically eliminates the olfactory episodes as well.
If no clear cause is found, phantosmia sometimes resolves on its own over weeks to months. In persistent cases, an ENT specialist can evaluate whether the issue is originating in the nose itself or deeper in the brain’s smell-processing pathways, which helps determine the next step.