Phantom Smells in Perimenopause: Why You're Sniffing Things That Aren't There

Can perimenopause cause phantom smells?

It may, and you are in the group that reports them most. A 2018 study from the NIH's institute for hearing and smell looked at over 7,000 Americans aged 40 and up. About 1 in 15 said they sometimes smell odors that are not there. Women reported it about twice as often as men. The gap was widest before age 60. Phantom smells were also more common between 40 and 60 than later in life.

The study did not measure hormones, so it cannot say why. But the timing lines up with perimenopause. Estrogen appears to play a role in how smell works. A woman's sense of smell shifts across the menstrual cycle, and it tends to weaken after menopause. When estrogen swings unpredictably, smell signals may misfire too.

It helps to know the limits. No study has yet proven that hormone swings cause phantom smells. Most research on smell and menopause looks at the years after menopause, not the transition itself. The NIH study also named other risk factors: head injury, dry mouth and poor general health.

Phantosmia vs parosmia: phantom smells and distorted smells

Phantosmia means your brain senses an odor when no scent is reaching your nose. It can feel completely real. It may be vivid enough to make you check the stove or step outside to find the source.

Parosmia is related but different. A real smell reaches your nose, but your brain reads it wrong. Coffee might smell like burning plastic, or a flower might smell like chemicals. Both can happen during hormonal change.

• Phantosmia: you smell an odor that has no outside source.
• Parosmia: a real smell comes across as something else, often unpleasant.
• Hyperosmia: smells that really exist seem much stronger than before. Some women report this in perimenopause.
• Hyposmia: your sense of smell gets weaker. It is more common after menopause than during the transition.

Smelling smoke or burning that isn't there: the most common phantom smells

The odor varies from person to person. But some descriptions come up again and again, in clinical reports and in women's own accounts.

• Cigarette smoke or burning tobacco: often the most reported.
• Something burning: electrical, wood, or a burning smell you cannot place.
• Chemicals: bleach, ammonia, or a sharp synthetic smell.
• Rotting or spoiled food: the NIH study named this as a typical one.
• Sweet or sickly smells: sometimes described as artificial or syrupy.
• Metal: a sharp smell like iron or blood.

Most episodes are brief and pass on their own. Some women notice them at a certain time of day, during stress, or at certain points in their cycle.

Is a phantom smell ever a sign of something serious? Other causes to know

Hormones are one possible reason for phantom smells at this age, but not the only one. Most other causes are minor. A few come with warning signs worth knowing.

Sinus and nose problems

Nasal polyps, a long-running sinus infection, or an active cold can irritate the smell nerves. These usually bring other nose symptoms too, like congestion, drip down the throat, or a weaker sense of smell overall. That helps tell them apart from a hormonal cause.

After COVID-19

Smell problems after COVID-19 are well recognized, including both phantom and distorted smells. They can last for months. If your phantom smells began after a COVID-19 illness, that is a likely cause, whatever your hormones are doing.

Migraine

Some people smell a phantom odor, often burning, just before or during a migraine. It is rare. Headache experts do not yet list it as an official type of aura, the warning signs some people get before a migraine. Still, if your episodes keep lining up with headaches, migraine is worth raising with your doctor.

Temporal lobe seizures

The temporal lobe is a part of the brain involved in smell. Seizures that start there can cause brief smell hallucinations, often of burning or chemicals. They are usually very short. They may come with confusion or a feeling of being out of it. That combination is one of the red flags below.

Parkinson's and other brain conditions: rare

Changes in smell can be an early sign of Parkinson's disease and, less often, Alzheimer's. But in these conditions, the usual change is a weaker sense of smell, not phantom smells. Phantom smells on their own, with no other nerve symptoms, are generally not a sign of these diseases.

Red flags: when a phantom smell needs prompt care

Most phantom smells in perimenopause do not need urgent action. But some patterns should prompt a call to your doctor. A few need emergency care.

• A phantom smell that starts suddenly with a severe or unusual headache
• Any episode with confusion, a memory gap, or a strange shift in awareness. This could be a seizure.
• Passing out, even briefly
• Phantom smells with a fever, which can signal an infection affecting the brain
• Episodes that grow more frequent or stronger over weeks
• New phantom smells after a head injury
• Phantom smells with vision changes, trouble speaking, or weakness on one side of the body

If any of these apply, do not wait for a routine visit. A phantom smell with nerve symptoms needs same-day or emergency care.

What helps with phantom smells

Maybe your episodes are brief and rare, with none of the red flags above. Then there is a good chance they follow your hormone swings. They often ease after menopause, once estrogen settles at a lower but steady level.

• Keep a short log: note the time, how long it lasted, the smell, and what came before it, like stress, poor sleep or your cycle. Patterns help if you bring it to a doctor.
• Mention it at your next visit: even if it feels too minor. A few focused questions can rule out sinus, brain or other causes.
• Ask about HRT if you are already weighing it: research on hormone therapy and smell is mixed, and none has tested it for phantom smells. It is still worth adding to the conversation.
• Protect sleep and ease stress: both can make many perimenopause symptoms flare. Smell episodes may be one of them.
• Keep a headache diary if migraine is possible: it helps spot triggers and supports a diagnosis.

Do phantom smells go away after menopause?

For many women, they do. Brief phantom smells without other nerve symptoms are generally not a sign of danger. They do not mean something is permanently wrong with your nose or your brain. Most women find the episodes come and go. Many see them fade as their hormones settle.

Some women notice a general dip in smell later on. That is a separate change, linked to lower estrogen over the long term.

The key is to know your red flags. It is also to take your own symptoms seriously, even the strange ones.