Smelling bubblegum when there’s no obvious source is almost always a phantom smell, a real neurological phenomenon where your brain generates a scent that isn’t actually present. About 5% of adults experience phantom smells, and while most people report smoky or burnt odors, pleasant smells like bubblegum, candy, or baked sweets are a well-documented variation. The cause ranges from something as minor as a sinus infection to something that deserves a closer look, like a medication side effect or a neurological condition.
Phantom Smells vs. Distorted Smells
There are two distinct ways your sense of smell can go wrong, and telling them apart helps narrow down what’s happening. Phantosmia is the perception of a smell with no source at all. You’re sitting in a room, nothing around you smells like bubblegum, but the scent is unmistakable. Parosmia, on the other hand, is a distortion of a real smell. Something in your environment does have an odor, but your brain misinterprets it. Coffee might smell like candy, or a cleaning product might register as something fruity.
Both conditions share many of the same triggers, but the distinction matters if you end up seeing a doctor. If the bubblegum smell only appears around certain foods or products, parosmia is more likely. If it shows up randomly, with no identifiable source, you’re dealing with phantosmia.
The Most Common Causes
The majority of phantom sweet smells trace back to something happening in your sinuses or upper respiratory system. Sinus infections, colds, allergies, and nasal polyps can all irritate or inflame the olfactory nerves that run from your nose to your brain. When those nerves misfire, you perceive a smell that isn’t there. These cases typically resolve on their own once the underlying infection or inflammation clears up.
COVID-19 deserves special mention. Many people developed phantosmia after a COVID infection, sometimes months into recovery. The virus is known to damage olfactory neurons directly, and the repair process can produce phantom or distorted smells that linger for weeks or months before gradually fading.
Dental problems are another overlooked cause. Gum disease, dry mouth, and infections in the teeth or gums can produce unusual taste and smell sensations, including sweet ones, because the oral and nasal cavities share nerve pathways.
Medications That Trigger Phantom Smells
Several common drug classes are linked to phantom odor perception. A large population-based study found that nine medication categories were significantly associated with phantom smells: cholesterol-lowering drugs, antidepressants, pain relievers, diabetes medications, acid reflux drugs (proton pump inhibitors), anticonvulsants, certain blood pressure medications, anti-anxiety and sleep medications, and muscle relaxants.
The connection was strongest in adults over 60. In that group, diabetes medications, cholesterol drugs, and proton pump inhibitors were each associated with 74 to 88% higher odds of experiencing phantom smells compared to people not taking those drugs. If you started smelling bubblegum around the same time you began a new medication, that timing is worth noting and bringing up with your prescriber.
Migraines and Seizure Activity
Brief, vivid phantom smells can be a feature of migraines or temporal lobe epilepsy. In migraines, the smell may appear as part of the aura phase, the sensory warning signs that precede the headache. The scent can be pleasant or unpleasant and typically lasts minutes.
Temporal lobe epilepsy is particularly associated with olfactory hallucinations. The temporal lobe processes smell, and abnormal electrical activity there can generate sudden, intense odors that feel completely real. These episodes are usually brief, lasting seconds to a couple of minutes, and may come with other subtle signs: a wave of déjà vu, a rising sensation in the stomach, brief confusion, or a momentary loss of awareness. If the bubblegum smell hits suddenly, lasts less than a minute, and repeats in a pattern, this is a possibility worth investigating.
Metabolic Changes and Ketones
Your body’s chemistry can produce real sweet-smelling compounds that you then detect on your own breath or skin. The most well-known example is diabetic ketoacidosis, a dangerous complication of diabetes where the body breaks down fat for fuel and produces ketones. One of those ketones, acetone, creates a distinctly fruity or sweet odor on the breath. You might interpret this as bubblegum, candy, or nail polish remover.
You don’t need full-blown ketoacidosis to notice this. People on very low-carb or ketogenic diets also produce elevated ketones, and some notice a persistent sweet smell that seems to follow them. If the bubblegum scent seems strongest near your own breath and you’re either diabetic or eating very few carbohydrates, ketones are a likely explanation.
Environmental Sources Worth Checking
Before assuming the smell is phantom, it’s worth ruling out a real source. Bubblegum flavor is a blend of synthetic fruit esters, and several everyday products contain similar compounds. Methyl anthranilate, for example, is found in perfumes, cosmetics, household cleaners, and dozens of consumer products. It carries a grape-like, floral, honey-like scent that can overlap with what people describe as “bubblegum.” Essential oils like ylang-ylang and bergamot contain it naturally.
Check nearby air fresheners, candles, personal care products, laundry detergent, or anything recently cleaned. Scents from neighboring apartments, HVAC systems, or even outdoor sources like flowering plants can be surprisingly persistent and hard to localize. If the smell appears only in certain locations or at certain times of day, an environmental source is the most likely answer.
Less Common but Serious Causes
In rare cases, persistent phantom smells point to a neurological condition. Brain tumors, stroke, head trauma, Parkinson’s disease, and Alzheimer’s disease can all cause phantosmia by disrupting the brain regions that process smell. These conditions almost always come with other symptoms: persistent headaches, changes in memory or cognition, weakness on one side of the body, tremors, or personality changes. A bubblegum smell on its own, without any other neurological symptoms, is unlikely to indicate something this serious, but a smell that persists for weeks, worsens, or appears alongside any of those symptoms warrants imaging or a neurological evaluation.
Exposure to toxic chemicals, particularly mercury or lead, can also damage olfactory nerves and produce phantom smells. This is relevant if you work in industrial settings, older buildings undergoing renovation, or environments with known chemical exposure.
What to Do About It
If the bubblegum smell appeared during or after a cold, sinus infection, or COVID, patience is the most effective approach. Most cases resolve within weeks to a few months as the olfactory nerves heal. Saline nasal rinses can help by reducing inflammation in the nasal passages.
If you suspect a medication is the cause, keep a log of when the smell appears relative to your doses. This gives your doctor concrete information to work with. Switching medications or adjusting doses often resolves medication-related phantosmia.
For smells that are persistent, recurring in a pattern, or accompanied by headaches, confusion, or other neurological symptoms, a doctor will typically start with a physical exam of the nasal passages and may order brain imaging to rule out structural causes. Phantosmia driven by neurological conditions is harder to treat, but identifying the underlying cause is the critical first step.