For most people, smell and taste start returning within one to two weeks after a viral infection like COVID-19, a cold, or the flu. About 74% of people report their smell has recovered within 30 days, and by six months, that number climbs to roughly 95%. Taste tends to bounce back slightly faster than smell, with 79% recovering within a month and 98% by six months.
The Typical Recovery Timeline
The first signs of improvement usually appear within the first week. Many people notice faint whiffs of strong odors, or food starts tasting slightly less bland. By two weeks, most people experience substantial improvement, even if things aren’t fully back to normal yet.
Recovery doesn’t happen all at once. You might smell coffee one morning but not be able to detect your shampoo. Certain scents return before others, and the process can feel uneven from day to day. This is normal. Your smell receptors are regenerating at different rates, and the nerve fibers reconnecting to your brain each follow their own schedule, with individual pathways taking anywhere from 30 to 90 days to rebuild.
For the roughly 25% of people who haven’t fully recovered by one month, improvement typically continues steadily over the following months. Research shows recovery can continue for at least two years after infection, so a slow start doesn’t mean you’re stuck.
Why Food Tastes Bland When You Lose Smell
Your tongue can only detect five basic sensations: sweet, salty, sour, bitter, and umami. Everything else you think of as “taste” is actually flavor, and flavor depends heavily on smell. When you chew food, odor molecules travel up the back of your throat into your nasal cavity, a process called retronasal smell. Your brain blends this smell information with input from your taste buds to create the full experience of flavor.
This is why losing your sense of smell makes food seem so flat. Your taste buds are usually still working fine. You can still detect that something is sweet or salty, but the richness, the difference between strawberry and cherry, between chicken and pork, comes from smell. Once your smell receptors start regenerating, flavor returns with them.
What Parosmia Means for Recovery
Some people go through a phase where familiar smells become distorted or even disgusting. Coffee might smell like sewage, or cooked meat might trigger nausea. This is called parosmia, and it’s actually considered a sign that your smell nerves are regenerating. Common triggers include coffee, onions, garlic, fried or roasted meats, eggs, toothpaste, and bell peppers.
Parosmia can appear weeks or months after the initial infection, catching people off guard just when they thought they were getting better. For some, the distortions are mild and merely odd. For others, they’re strong enough to cause gagging or vomiting, and can lead to appetite loss, weight changes, and social withdrawal. The distortions typically fade over weeks to months as nerve connections mature, though the timeline varies widely.
A related but less common experience is phantosmia, where you smell something that isn’t there at all, like smoke or burning when nothing is burning. This originates in the brain rather than from an actual odor source and generally resolves on its own.
Smell Training: The Best Evidence-Based Option
Olfactory training, or “smell training,” is the most consistently recommended approach for speeding recovery. The protocol is straightforward: sniff four distinct scents for 20 to 30 seconds each, twice a day, for at least 24 weeks. The standard scents are rose, eucalyptus, lemon, and clove, chosen because they activate different types of smell receptors.
The ideal routine is once in the morning before breakfast and once in the evening before bed. You can use essential oils on cotton pads placed in small jars. While you sniff, try to actively recall what the scent should smell like. This mental effort appears to help the regenerating nerves form the right connections.
A pilot study found that combining smell training with a short course of oral corticosteroids produced significantly better results than smell training alone, with an average improvement nearly four times greater after 10 weeks. However, steroids carry side effects and aren’t appropriate for everyone, so this is a conversation for your doctor if smell training alone isn’t working.
Other treatments that have been studied, including zinc, vitamin A, and alpha-lipoic acid, haven’t reached strong levels of evidence. Smell training remains the first-line recommendation.
When Recovery Takes Longer
Post-viral smell loss is one of the most common causes of lasting olfactory problems, responsible for 18 to 45% of all cases of smell disorders. After COVID-19 specifically, studies report that 27 to 60% of people still have some degree of smell dysfunction at six months, 26 to 46% at one year, and about 8% at two years. These numbers are higher than the self-reported recovery rates, likely because objective testing picks up subtle deficits that people don’t notice in daily life.
The good news is that spontaneous recovery has been documented as late as three years after onset. The olfactory system is one of the few parts of the nervous system that continuously regenerates throughout life. Stem cells in the lining of your nasal cavity produce new smell neurons that grow, extend their fibers to the brain, and form new connections. This process is slow but persistent.
Safety While You Wait
Living without smell creates real safety risks that are easy to overlook. You may not detect a gas leak, spoiled food, smoke, or chemical fumes. About 60% of people with smell loss take some precautions at home, but that means 40% don’t.
Practical steps worth taking: install a natural gas detector (these aren’t standard in most homes the way smoke detectors are), check that your smoke and carbon monoxide detectors are working, pay attention to expiration dates on food rather than relying on the sniff test, and ask someone in your household to serve as a “smell check” when needed. These precautions matter most for people who live alone.
Red Flags Worth Noting
Most post-viral smell loss resolves on its own or with smell training. But certain symptoms suggest something beyond a simple viral injury. These include smell loss on only one side of the nose, nasal bleeding or crusting, swelling around the eyes, visual changes, severe frontal headaches, or new neurological symptoms. Any of these warrant prompt evaluation.
For straightforward post-viral smell loss without red flags, current guidelines suggest allowing about three months for spontaneous recovery before pursuing specialist evaluation. If your smell hasn’t improved at all after that window, or if it’s been more than six weeks following a non-COVID upper respiratory infection, an ENT evaluation can help rule out other causes like nasal polyps or structural issues and guide next steps.