You might notice it in small, everyday moments: coffee doesn’t smell quite as rich, your shampoo seems less fragrant, or you have to lean in closer to catch the scent of flowers. Changes in smell are common as people get older, and they can be so gradual that families don’t talk about them until something feels “off.”
Most of the time, shifting smell sensitivity is a normal part of aging. But sometimes it’s a useful clue—about allergies, chronic sinus problems, medication side effects, dental issues, or (more rarely) neurological disease. Because smell plays a quiet role in nutrition, safety, and quality of life, it’s worth understanding what’s typical, what’s not, and when it’s time to bring it up with a clinician.
Why smell changes with age
Your sense of smell (olfaction) is built on a delicate pathway: odor molecules enter the nose, reach smell receptor cells high in the nasal cavity, and trigger signals that travel to the olfactory bulb and deeper brain regions involved in memory and emotion. Aging can affect several points along that pathway.
1) Fewer or less responsive smell receptors. Smell receptor neurons can regenerate, but that regenerative capacity may slow with age. With fewer functioning receptors or reduced sensitivity, the brain receives a weaker “signal” from everyday scents.
2) Changes in airflow and nasal health. Age-related changes in the nose—drier nasal passages, chronic inflammation, or structural changes—can reduce how well odor molecules reach the smell receptors.
3) Brain processing changes. Smell isn’t just about the nose. The brain has to interpret the signal, compare it to memory, and identify it. Normal aging can affect processing speed and sensory integration, making identification harder even when detection is still possible.
4) Cumulative wear-and-tear from life exposures. Decades of colds, allergies, sinus infections, exposure to smoke or air pollution, and certain workplace chemicals can all add up. Some exposures irritate the nose; others may affect nerve function.
One important nuance: people often use “taste” as shorthand for flavor. But much of what we experience as flavor is actually smell, especially “retronasal” smell—odors traveling from the mouth up to the nasal cavity while you chew and swallow. That’s why a change in smell can make food seem bland, even if your taste buds (sweet, salty, sour, bitter, umami) are still working.
What changes can look like (and what’s considered common)
Smell changes don’t always mean total loss. Many people experience one or more of these:
Reduced sensitivity (hyposmia). You can smell, but it’s faint. You may notice it first with subtle scents like herbs, mild perfumes, or the smell of rain.
Difficulty identifying odors. You detect “something,” but you can’t name it right away, or you confuse similar smells.
Different smell intensity day to day. Nasal congestion, humidity, allergies, or reflux can make smell seem better or worse depending on the day.
Distorted smells (parosmia) or phantom smells (phantosmia). Some people report that familiar foods smell “off” or that they smell something that isn’t there. These symptoms deserve a mention to a clinician, particularly if they’re new or bothersome.
Gradual, mild decline can be part of aging. What’s less “typical” is a sudden change, a change on just one side of the nose, or smell loss with other new neurological symptoms (like tremor, balance problems, or noticeable memory changes).
Common, fixable reasons your sense of smell shifts
Before assuming age is the only reason, it helps to consider more common (and sometimes treatable) causes.
Nasal congestion and inflammation. Allergic rhinitis, non-allergic rhinitis, chronic sinusitis, and nasal polyps can block airflow to smell receptors or inflame the lining of the nose. If you notice smell improves when congestion improves, that’s a clue.
Upper respiratory infections. Colds, influenza, and other respiratory viruses can temporarily reduce smell. Sometimes a post-viral smell change lingers longer than expected, even after other symptoms resolve.
Dental and oral health issues. Gum disease, tooth infections, and poor oral hygiene can alter the way the mouth and nose perceive flavors and odors. Dry mouth (which can worsen with age or certain medications) can also change how food tastes and smells.
Reflux. Acid reflux and laryngopharyngeal reflux can irritate the upper airway, contributing to chronic throat clearing, hoarseness, and sometimes smell changes.
Medications. Many medications can affect smell or taste indirectly by causing dry mouth, nasal dryness, or changes in mucus. Some can alter sensory perception more directly. If the timing lines up with a new medication or dose change, it’s worth discussing with a prescriber—don’t stop a medication on your own.
Smoking and secondhand smoke. Smoke exposure can dull smell and taste. The good news is that some recovery may happen after quitting, though it varies by person and duration of exposure.
Environmental irritants. Air pollution, solvents, and certain workplace exposures can inflame nasal tissues or affect nerve function. Even strong household cleaners can trigger irritation in some people.
Why it matters more than you might think
Smell changes can seem like a minor inconvenience—until you look at the ripple effects on daily life.
Nutrition and appetite. When food seems less flavorful, people may eat less, lose interest in cooking, or rely on salt and sugar to compensate. Over time, that can affect weight, blood pressure, blood sugar control, and overall nutrition.
Safety at home. Smell helps detect smoke, gas leaks, spoiled food, and certain chemical fumes. If smell is reduced, families may need extra safety measures (like ensuring smoke and carbon monoxide alarms are functional and considering natural gas detectors where appropriate).
Emotional well-being and connection. Smell is tightly linked to memory and comfort—think of family recipes, a partner’s cologne, a baby’s scent, or holiday traditions. Losing that sensory connection can feel surprisingly sad or isolating, and it’s okay to name that.
Hygiene awareness. People may worry they can’t detect body odor, smoke on clothing, or a dirty diaper or litter box smell. That anxiety can affect confidence and social comfort.
When it’s worth mentioning to a clinician
If smell changes are mild and gradual, you can still bring them up at a routine visit—especially if they affect eating or safety. But certain situations deserve a more direct conversation sooner.
Call or message your clinician promptly if:
• The change is sudden or dramatic. A rapid shift over hours or days is different from slow change over years.
• You have one-sided symptoms. Smell loss or persistent blockage that seems mainly on one side can sometimes suggest a structural issue that needs evaluation.
• It follows a head injury. Trauma can affect smell nerves. Even a “minor” fall is worth mentioning if smell changes afterward.
• You notice distorted or phantom smells. These can happen for benign reasons, but new or persistent parosmia/phantosmia should be discussed.
• There are ongoing sinus symptoms. Facial pressure, thick nasal drainage, frequent infections, or long-standing congestion could point to chronic sinusitis or polyps.
• Smell changes come with new neurological symptoms. Examples include tremor, stiffness, new balance problems, or notable cognitive changes. Smell loss can appear in a range of conditions, and it’s one piece of a larger picture a clinician can assess.
• Eating patterns or weight are changing. Reduced intake, unintentional weight loss, or a sudden preference for overly salty/sugary foods is worth addressing.
• You’re at risk for household hazards. If you live alone, cook often, or rely on smell to notice hazards, bring it up so you can plan practical safeguards.
For children and teens, smell changes aren’t usually “age-related,” so persistent symptoms in younger family members—especially with nasal obstruction, frequent infections, or allergy symptoms—should be evaluated.
What an evaluation may include
Clinicians typically start with a detailed history and a nose and throat exam. Depending on the situation, they may:
Review medications and timing. This includes prescription drugs, over-the-counter products, and supplements.
Assess nasal and sinus health. They may look for swelling, polyps, or signs of chronic inflammation. Some patients are referred to an ear, nose, and throat (ENT) specialist.
Consider formal smell testing. In some settings, standardized smell identification tests help quantify the problem and track change over time.
Address contributing conditions. If allergies, chronic rhinitis, reflux, or infection is suspected, treating those can improve smell in some people.
Order imaging only when indicated. If there are red flags (like one-sided obstruction, concerning neurological symptoms, or persistent unexplained loss), imaging may be considered. Many people with gradual, symmetric age-related decline won’t need scans.
Practical ways families can adapt at home
Whether the change is mild or more significant, small adjustments can make life easier and safer.
Upgrade safety systems. Make sure smoke alarms and carbon monoxide alarms are installed, functioning, and have fresh batteries. If you have gas appliances, consider whether a gas detector makes sense for your home setup.
Use visual and date-based food safety habits. Rely less on “smell test” for leftovers. Label containers with dates, follow food storage guidelines, and when in doubt, throw it out.
Make food more interesting without overdoing salt/sugar. Try adding texture (crunchy nuts, toasted breadcrumbs), acid (lemon, vinegar), heat (pepper, chili flakes), fresh herbs, garlic, ginger, and aromatics. Serving food warm (not lukewarm) can enhance aroma and enjoyment.
Support hydration and oral health. Dry mouth and dental problems can worsen flavor perception. Regular dental care, good hydration, and addressing mouth dryness can help.
Build routine checks into hygiene and home life. If someone worries about body odor or smoke on clothing, a trusted family member can do discreet check-ins, or you can lean on consistent routines (laundry schedule, shower schedule) rather than scent cues.
Talk about it plainly. Many people feel embarrassed admitting they can’t smell. A simple, nonjudgmental question—“Have you noticed changes in smell or taste?”—can open the door to support.
A note about smell training
Some clinicians recommend “smell training” for certain types of smell loss, especially after viral illnesses. It generally involves repeatedly smelling a small set of distinct scents (often essential oils) on a schedule over time. Research suggests it may help some people, though results vary and it’s not a quick fix.
If you’re considering it, it’s reasonable to ask an ENT clinician for guidance—especially if you have asthma, fragrance sensitivities, migraines triggered by odors, or concerns about which products to use.
How to start the conversation at a checkup
If you’re not sure whether the change is “enough” to mention, these prompts can help you describe it clearly:
• Timing: When did you first notice it? Has it been gradual or sudden?
• Pattern: Is it constant, or does it fluctuate with congestion or seasons?
• Severity: Can you smell strong odors (coffee, vinegar, perfume)? Can you smell smoke or gas?
• Associated symptoms: Congestion, facial pressure, headaches, reflux, dry mouth, recent illness, or head injury?
• Impact: Has it changed appetite, weight, enjoyment of food, or safety concerns?
• Medications and exposures: Any new medications, dose changes, smoking history, or workplace irritants?
What to watch for in older relatives
Because smell changes can develop slowly, family members sometimes notice the effects first—like more heavily salted cooking, less interest in favorite meals, or repeated questions about whether food has spoiled. If you’re concerned, focus on practical support rather than criticism.
You can say something like: “I’ve noticed you don’t seem to enjoy food the way you used to—have you noticed any changes in smell or taste?” If they say yes, encourage them to mention it at their next appointment, especially if it’s affecting eating or safety.
The bottom line
A changing sense of smell is often a normal part of aging, and it doesn’t automatically signal something serious. But it isn’t trivial either: it influences nutrition, safety, and day-to-day pleasure. The most helpful approach is to treat it like any other health change—notice patterns, consider common causes like congestion or medications, and bring it up when it’s new, sudden, disruptive, or paired with other symptoms.
If you’re unsure, mentioning it is rarely a waste of time. A short conversation can uncover a fixable problem, help you put safety measures in place, or simply provide reassurance that what you’re experiencing makes sense.