In 2020, developing a change in your smell and/or taste was a sign that you may have COVID-19. Now, nearly three years later, researchers have determined that about 5% of adults who reported an initial change in their smell or taste after contracting COVID-19 may go on to have long-lasting issues with those senses.
According to a new research from The BMJ, at least 15 million of adults may experience long-term smell deficiencies, while 12 million adults may struggle with taste. The research also found that only 74% of patients reported smell recovery and 79% reported taste recovery 30 days after initial infection, but recovery rates increased with each passing month.
Researchers reviewed 18 observational studies involving nearly 4,000 patients and learned that women were less likely to recover their sense of smell and taste compared to men. Meanwhile, patients who experienced “greater initial severity of smell loss and those with nasal congestion were less likely to recover their sense of smell,” according to a press release about the study.
Additionally, researchers believe most patients are anticipated to recover their sense of smell or taste within the first three months following infection, but “a major group of patients might develop long lasting dysfunction that requires timely identification, personalized treatment, and long term follow-up.”
Indeed, a change in taste and smell is just one of many symptoms of long COVID. Loss of taste and smell can also be due to other illnesses, such as the common cold, flu and sinus infections, as well as certain medications and age. Total loss of smell (anosmia) or loss of taste (aguesia) is uncommon.
For those looking to proactively repair their sense of smell or taste, there is olfactory training, which involves sniffing the same four scents every day for about 20 seconds each scent, according to AbScent, a UK-based charity dedicated to ending smell disorders.
As rhinologist Dr. Zara Patel, a professor of otolaryngology, head and neck surgery at Stanford University School of Medicine, recently told CNN, “The way I explain it to patients is if you had a stroke, and it made your arm not work, you would go to physical therapy, you would do rehab. That’s exactly what olfactory training is for your sense of smell.”