Phantosmia, the perception of a smell that is not actually present, does not have a single reliable cure, but several treatments can reduce or eliminate the phantom odors depending on the underlying cause. Options range from smell retraining exercises you can do at home to prescription steroids, experimental medications, and in rare severe cases, surgery. The right approach depends on what is driving the phantom smell in the first place, and for many people the condition resolves on its own over weeks to months.
What Phantosmia Smells Like and Why It Happens
Phantom smells are not random. In a population-based study of older adults, the most commonly reported phantom odor was smoky or burnt, accounting for nearly half of specified cases. Other reported smells included moldy, metallic, rotten, cooked food, perfume, and floral scents, and about a quarter of affected individuals reported more than one type of phantom smell at the same time.1PubMed Central. Phantom Smells: Prevalence and Correlates in a Population-Based Sample of Older Adults That burnt or smoky quality is worth noting because it is so distinctive. If you are smelling something acrid that nobody else around you can detect, phantosmia is a strong possibility.
The causes span a wide range. Documented triggers include head trauma, stroke, intracranial tumors, surgery near the olfactory groove, radiation therapy, migraines (where a phantom smell can serve as an aura), epilepsy, and psychiatric conditions such as schizophrenia and depression. Viral illnesses like influenza and infectious mononucleosis have also been linked to the onset of phantosmia, and post-COVID cases surged after 2020.2PubMed Central. A case study of phantosmia cured by antibiotic treatment of an intranasal Pseudomonas stutzeri infection In some patients, no identifiable cause is ever found. That idiopathic group is common and, frustratingly, the hardest to treat with confidence because there is no root problem to target.
Phantosmia should not be confused with parosmia, where a real smell is present but your brain distorts it into something unpleasant. With phantosmia, there is no external odor source at all.3PubMed Central. Parosmia and Phantosmia: Managing Quality Disorders The distinction matters because some treatments studied for parosmia overlap with phantosmia research, but the two conditions can behave differently and respond to different interventions.
When to See a Doctor
Occasional phantom smells that come and go are not necessarily a medical emergency, but persistent phantosmia deserves professional evaluation. One reason is that phantom smells can, in rare cases, signal something serious. Olfactory auras have been recognized for decades as a symptom of epilepsy, particularly when a lesion is present in the temporal lobe.4PubMed Central. Acute phantosmia as the first manifestaton of brain metastases in a patient with breast cancer. Case report Brain tumors, meningiomas, and metastatic cancer are uncommon causes but important ones to rule out.
The typical diagnostic workup starts with a nasal endoscopy to check for local problems like polyps or infection. When that comes back normal, an MRI is often ordered to rule out intracranial causes such as tumors affecting the olfactory pathway.5PubMed Central. Magnetic resonance imaging findings in patients with idiopathic olfactory dysfunction and normal findings on nasoendoscopy If both are clear, the diagnosis is usually idiopathic phantosmia, and the focus shifts to symptom management.
Olfactory Training
The most widely recommended first-line approach is olfactory training, sometimes called smell retraining therapy. The idea is straightforward: you deliberately sniff a set of strong, distinct odors twice a day for several months. Classic protocols use four scents representing different odor categories, often rose, eucalyptus, lemon, and clove. Each sniffing session lasts about 20 seconds per scent. A systematic review found that classical olfactory training produced improvements in olfactory function in roughly 20 to 30 percent of patients across different causes of smell loss, with clinically meaningful results reported across the studies reviewed.6PubMed. Classical Olfactory Training for Smell Restoration: A Systematic Review
Most of the olfactory training literature focuses on general smell loss and parosmia rather than phantosmia specifically, but the approach has been adopted in phantosmia management as well. A study on modified olfactory training in post-COVID patients with parosmia found that extending the training from six to nine months produced additional improvement in both symptoms and smell discrimination scores, with the treatment group outperforming controls at every time point measured.7PubMed Central. Modified Olfactory Training Is an Effective Treatment Method for COVID‐19 Induced Parosmia The takeaway is that patience matters. If you have been doing smell training for a few weeks with no results, that does not mean it has failed. The evidence points to benefits accumulating over months, not days.
The appeal of olfactory training is that it is safe, cheap, and can be done at home. The drawback is that it works slowly and does not help everyone. For people whose phantosmia is severely affecting their quality of life, waiting several months for a possible improvement may feel inadequate, and additional treatments are worth discussing with a doctor.
Steroids and Nasal Therapies
Corticosteroids, both oral and nasal, are frequently used in clinical practice to manage phantosmia, particularly when it follows a viral infection or is associated with nasal inflammation. A case series of post-COVID phantosmia patients treated with a combination of a short oral steroid burst, nasal steroid irrigation in saline, and smell training reported improvement, though the authors acknowledged this was not compared to an untreated control group.8Rhinology Online. Characterization, treatment modalities, and self-perceived improvement of post-COVID-19 phantosmia: a case series of eleven patients That caveat is important. Because phantosmia frequently resolves on its own, especially after viral illnesses, it is genuinely hard to know how much of the improvement would have happened without treatment.
Nasal saline rinses on their own are commonly recommended as a low-risk measure. They help clear irritants and mucus from the nasal cavity, and many patients find them soothing even if the direct effect on phantom smells is modest. Some doctors combine saline irrigation with a budesonide suspension, delivering a topical steroid directly to the olfactory region. The evidence for this specific combination in phantosmia is mostly limited to case reports and small series rather than randomized trials, so it falls into the category of reasonable to try but not proven.
Medications Under Investigation
No medication is currently approved specifically for phantosmia, but a handful of drugs have attracted research interest. Gabapentin, a neuromodulatory drug commonly used for nerve pain and seizures, has shown mixed results. An early study reported improvement in post-COVID parosmia in nearly 90 percent of patients treated with low-dose gabapentin on a titrated schedule, but it included only nine patients. A subsequent randomized controlled trial using higher doses failed to show benefit, and the higher dosing may have introduced side effects that offset any gains.9PubMed Central. COPANOS: use of gabapentin in the management of post-viral parosmia – a double-blind, randomised, placebo-controlled, multi-site trial – study protocol A larger multi-site trial is now underway to determine whether low-dose gabapentin truly works. Until those results are in, gabapentin remains experimental for this use.
Some clinicians have tried antidepressants, anticonvulsants, or antipsychotics off-label, particularly in patients where phantosmia coexists with depression, anxiety, or a seizure disorder. These approaches target the neurological or psychiatric underpinning rather than the phantom smell itself, and success varies depending on the individual case. If your phantosmia is connected to a treatable underlying condition, managing that condition is often the most effective path to relief.
Local Anesthetics and Why They Fall Short
There is a long history of attempting to silence phantom smells by numbing the olfactory lining. In the 1960s, clinicians reported that applying a cocaine solution to the olfactory epithelium could temporarily stop olfactory distortions. A later evaluation of this technique in six phantosmia patients found no long-term benefit.10PubMed. Olfactory cocainization is not an effective long-term treatment for phantosmia The phantom smells came back once the drug wore off.
Lidocaine tells a similar story. When applied nasally, it caused a small, transient reduction in olfactory perception, with the maximum reduction of about 35 percent achieved at 60 milligrams roughly 15 minutes after administration. But perception climbed back toward normal within 30 minutes, and the effect could be partially overridden simply by increasing the strength of the odor stimulus.11PubMed Central. Effect of Lidocaine on Olfactory Perception in Humans For phantosmia, this means a topical anesthetic might briefly dull a phantom smell, but it is not a lasting fix.
Where these anesthetic tests do prove useful is diagnostically. If applying a topical anesthetic to one side of the nose eliminates the phantom smell, it suggests the signal is originating in the nasal lining (the peripheral olfactory system) rather than in the brain. That piece of information can help a clinician decide whether more aggressive interventions, including surgery, are worth considering.
Surgery as a Last Resort
For people with severe, unrelenting phantosmia that has not responded to any other treatment, surgical removal of the affected olfactory mucosa is an option. A long-term follow-up study concluded that surgical excision of olfactory epithelium is an effective and safe method to relieve phantosmia while potentially preserving overall olfactory ability.12PubMed. Long-term follow-up of surgically treated phantosmia A systematic review found that olfactory mucosa excision was the only surgical intervention studied for long-lasting phantosmia, with short-term improvement in 10 of 11 patients reviewed.13International Forum of Allergy and Rhinology. Management of long-lasting phantosmia: a systematic review
Those numbers are encouraging, but the context is important. The total number of patients studied remains very small, and the procedure carries the inherent risk of reducing or eliminating your sense of smell on the treated side. Surgeons typically reserve it for cases where the phantosmia is genuinely debilitating, where the phantom smell has been localized to one side of the nose through prior testing, and where conservative approaches have failed over a sustained period. It is not a casual option.
Repetitive Transcranial Magnetic Stimulation
Repetitive transcranial magnetic stimulation, or rTMS, uses targeted magnetic pulses to modulate brain activity. In a study of 17 patients with persistent phantosmia and associated smell and taste distortion, sham stimulation produced no changes, while real rTMS reduced distortions and improved sensory acuity in 15 of the 17 patients. Two of those 15 experienced complete and lasting elimination of their phantom smells for over five years. In the remaining 13, the benefits gradually faded, but repeated sessions were able to reinstate the improvement each time.14PubMed. Improvement in smell and taste dysfunction after repetitive transcranial magnetic stimulation
An 88 percent response rate sounds promising, but rTMS for phantosmia remains experimental. The treatment requires specialized equipment and trained operators, is not widely available for this indication, and in most responders it needs to be repeated. It is most likely to be relevant for patients who have exhausted simpler options and have access to a research center or clinic that offers it. Still, for a condition that sometimes resists everything else, the existence of an approach that can reproducibly tamp down phantom smells is noteworthy.
Alpha-Lipoic Acid and Other Supplements
Alpha-lipoic acid, an antioxidant sometimes recommended for nerve-related conditions, has a complicated track record in olfactory dysfunction. An older study of patients with smell loss following upper respiratory tract infections found that oral alpha-lipoic acid at 600 milligrams per day for an average of four and a half months produced a statistically significant improvement in olfactory function.15The Laryngoscope. Lipoic Acid in the Treatment of Smell Dysfunction Following Viral Infection of the Upper Respiratory Tract That study helped put the supplement on the map for post-viral smell problems.
More recent evidence has been less encouraging. A double-blind randomized trial in patients with COVID-related olfactory loss found no significant difference between alpha-lipoic acid and a comparison treatment across multiple measures of smell function, including threshold, identification, and patient-reported scores.16PubMed Central. Alpha-lipoic acid does not improve olfactory training results in olfactory loss due to COVID-19: a double-blind randomized trial The supplement is generally safe at standard doses, so taking it is unlikely to cause harm, but the evidence does not strongly support it as an effective treatment for phantosmia specifically.
Omega-3 fatty acids, zinc, and B vitamins occasionally appear in informal recommendations for smell disorders, but rigorous evidence supporting any of them for phantosmia is thin to nonexistent. If you want to try supplements, there is little downside to standard doses of common nutrients, but setting realistic expectations matters. These are background support at best, not targeted treatments.
How Phantosmia Affects Daily Life
The psychological and social toll of phantosmia is often underestimated. Patients with qualitative olfactory disorders frequently describe food-related smells and mouth sensations as disgusting, awful, or metallic, leading to food avoidance that can cause nutritional problems and weight loss. Some patients report leaving the house while meals are being prepared to avoid the repulsive sensations triggered by cooking. The effects extend well beyond the kitchen: patients have described being disgusted by a partner’s natural body odor, avoiding intimacy, and in extreme cases giving up on dating entirely because of inability to control how they perceive other people’s scent.17PubMed Central. The impact of olfactory loss on quality of life: a 2025 review
These experiences are worth naming because they are often invisible to the people around the sufferer. Smell disorders lack the immediate sympathy that comes with visible injuries or well-known chronic conditions. Friends and family may not understand why you are not eating, why you seem withdrawn, or why you react strongly to seemingly ordinary environments. If phantosmia is affecting your mental health, relationships, or nutrition, bringing that up with your doctor is just as important as discussing the phantom smell itself. Some patients benefit from counseling or support groups in addition to whatever medical treatment they are pursuing.
Practical Steps You Can Take Now
If you are living with phantosmia and looking for a starting point, olfactory training is the safest and best-supported place to begin. You can set it up at home with four distinct essential oils or household scents: choose one floral, one fruity, one spicy, and one resinous. Sniff each for about 20 seconds, twice a day, and commit to doing this for at least three months before evaluating whether it is helping. Keeping a brief daily log of your phantom smell episodes, including their intensity and duration, gives you a useful record to share with a clinician and helps you notice gradual changes you might otherwise miss.
If olfactory training alone is not enough, a visit to an ear, nose, and throat specialist is a reasonable next step. They can assess whether there is a treatable nasal cause, discuss a trial of nasal steroid irrigations, and determine whether imaging is warranted. For post-viral phantosmia in particular, the combination of steroid rinses and smell training is a common clinical approach, even if the randomized trial data remain limited.
Avoiding known triggers can also help manage daily symptoms. Some people find that strong cooking odors, chemical fumes, or perfumes make their phantom smells worse or more frequent. Keeping your environment well-ventilated, using unscented personal products, and eating foods that are less likely to produce strong aromas during cooking can reduce the number of episodes you deal with in a given day. These adjustments will not cure phantosmia, but they can make the condition substantially more livable while you pursue other treatments or wait for natural resolution.