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Loss of Smell After COVID: Recovery & When to Seek Help

Loss of smell (anosmia) after COVID-19 is common and usually improves within weeks to months. Studies tracking patients at one year found the large majority recovered olfactory function [1]. Persistent cases may involve parosmia — distorted smells. Smell training, which involves deliberately sniffing four distinct scents twice daily for at least 12 weeks, is the most evidence-supported recovery approach [2].

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What is anosmia after COVID — and why does it happen?

Anosmia means a partial or complete loss of smell. In COVID-19, the virus appears to damage support cells (sustentacular cells) in the olfactory epithelium — the tissue lining the roof of the nasal cavity where smell receptors live. Unlike many other causes of smell loss, COVID-related anosmia often occurs without nasal congestion, because the problem is at the nerve-support-cell level rather than a simple blockage of airflow 1.

Parosmia is a related condition where smells return distorted — familiar foods may smell rotten, chemical, or deeply unpleasant. Many people pass through a parosmia phase on the way to fuller recovery, which, though distressing, can signal that the olfactory nerve fibers are regenerating.

How long does smell loss after COVID usually last?

Recovery timelines vary widely. Many people regain most of their smell within a few weeks. A prospective cohort study tracking 97 patients at 12 months found that 96 percent achieved objective olfactory recovery by one year 1. However, recovery is not always rapid or complete — a meaningful proportion experience changes persisting for many months, and improvement can continue even after a year, which is why ongoing smell training is encouraged rather than giving up early.

Factors that appear to influence recovery include age, the severity of initial loss, and whether parosmia develops, though none of these reliably predicts an individual's outcome.

What is smell training and does it actually help?

Smell training — also called olfactory training — involves deliberately and repeatedly sniffing a set of four distinct scents (typically rose, eucalyptus, lemon, and clove) twice daily for at least 12 weeks. The goal is to stimulate olfactory nerve regeneration through repeated, focused sensory exposure.

A systematic review of studies on post-viral olfactory dysfunction found that olfactory training improves smell function and that longer training periods (16 weeks or more) produce better outcomes than short courses 2. Clinicians have applied the same approach to post-COVID patients — it is safe, inexpensive, and available without a prescription using essential oils.

The key is consistency: brief, focused sniffing sessions done every day, concentrating on the memory of what that scent should smell like. Olfactory training kits are commercially available, or you can assemble your own.

Should I see a specialist, or can my primary care clinician help?

Your primary care clinician is a reasonable first stop. They can rule out other causes of smell loss — such as nasal polyps, sinus disease, or medication side effects — and refer you to an ENT specialist (otolaryngologist) or, in some cases, a neurologist.

An ENT can perform nasal endoscopy to look for structural problems, assess whether inflammation is contributing, and discuss options such as short courses of topical or oral corticosteroids. A systematic review found that corticosteroids may offer some benefit alongside smell training, though the evidence for steroids alone remains limited 2. Clinical researchers are also studying other approaches — including alpha-lipoic acid and platelet-rich plasma — but none has a strong enough evidence base to recommend broadly yet.

Gale can help you organize your symptom history, prepare questions for an ENT visit, or connect you with a clinician if you have not yet been evaluated.

What about parosmia — distorted smells?

Parosmia can be deeply disruptive. Common triggers include coffee, meat, onions, garlic, and toothpaste, which may smell sewage-like or chemical. For many people, parosmia emerges weeks to months after the initial smell loss and gradually resolves over additional months.

Practical strategies include identifying your personal trigger foods and temporarily avoiding them, focusing on foods that remain tolerable (often sweet or cold foods), and continuing smell training. A dietitian familiar with post-COVID symptoms can help ensure adequate nutrition during this period.

Patience is genuinely required. Parosmia that feels permanent at six months may still resolve substantially by twelve to eighteen months in many people.

Common questions

Is smell loss after COVID a sign of lasting nerve damage?

Not necessarily. Post-COVID anosmia reflects damage to support cells in the olfactory tissue, and those cells can regenerate. Studies tracking patients at one year find that the large majority recover meaningful smell [1]. Persistent loss at one year is less common, and research into treatments that may accelerate recovery is ongoing.

Can I speed up my recovery beyond smell training?

Smell training remains the most consistently supported approach [2]. Some clinicians offer a short course of corticosteroids if inflammation appears to be contributing. Other treatments are being studied but lack strong evidence at this time. Staying generally healthy — good sleep, managing stress, avoiding smoking — supports the conditions your olfactory tissue needs to repair.

Will my smell ever fully come back?

Most people recover substantially, and one-year follow-up studies are encouraging [1]. Recovery can continue for well over a year, so it is worth continuing smell training even if progress feels slow. An ENT specialist can give you the most individualized assessment.

What kind of doctor should I see for smell loss?

An ENT specialist — also called an otolaryngologist — is the appropriate specialist. They can examine your nasal and sinus anatomy, rule out other causes, and discuss treatment options. Some academic medical centers also have dedicated smell and taste clinics.

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When to seek evaluation promptly

  • —Sudden total smell loss that is not associated with a recent illness or allergy
  • —Smell loss accompanied by facial pain, significant nasal discharge, or vision changes
  • —Smell loss in someone who has not had a COVID-19 infection — other causes need evaluation
  • —Unexplained weight loss alongside smell or taste changes

This article is for general information only. It does not replace a clinical evaluation. An ENT specialist can assess your individual situation and recommend treatment. Gale can help you find and prepare for that visit.

References

  1. 1.Renaud M, Thibault C, Le Normand F, McDonald EG, Gallix B, Debry C, Venkatasamy A (2021). Clinical Outcomes for Patients With Anosmia 1 Year After COVID-19 Diagnosis. JAMA Network Open. doi:10.1001/jamanetworkopen.2021.15352 ✓Prospective cohort (97 patients) showing 96% achieved objective olfactory recovery by 12 months after COVID-19; establishes favorable prognosis for COVID-related anosmia
  2. 2.Yuan F, Huang T, Wei Y, Wu D (2021). Steroids and Olfactory Training for Postviral Olfactory Dysfunction: A Systematic Review. Frontiers in Neuroscience. doi:10.3389/fnins.2021.708510 ✓Systematic review confirming olfactory training as the evidence-based approach for post-viral smell loss; longer training periods produce better outcomes; limited evidence for corticosteroids as adjunct

2 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.