In her quest to overcome one of COVID-19’s strangest symptoms, Mariana Castro-Salzman was willing to try anything.
The 32-year-old visited an oncologist and got a CT scan of her head. She saw an ear, nose and throat doctor. Took steroids. Went to a neurologist who put her on anti-anxiety medication.
She began sniffing essential oils every day. A homeopath prescribed bath flowers, supplements and chaga mushrooms.
And yet, nearly a year after recovering from the coronavirus, her senses of smell and taste are still scrambled. Onions and garlic evoke a nausea that has nothing to do with their actual scent. Coffee smells like a burned tire, but worse.
Because of the distorted smells, a condition known as parosmia, she has endured headaches, lost weight and repeatedly broken down in tears.
“It’s like a mind game, because you remember all the smells and tastes, but then the second you put it in your mouth it’s nothing like it used to be,” the Los Angeles resident said. “It’s like a completely different experience.”
Loss of taste or smell may be the first thing that prompts someone to get tested for a coronavirus infection. Some studies, in fact, have found it to be the best predictor, the symptom that practically screams, “I’ve got COVID!”
But though a majority of people recover their senses within weeks, 10% suffer long-term smell dysfunction, some researchers estimate. In Castro-Salzman’s case, it started out with anosmia — complete loss of smell — before developing into parosmia.
Smell is instrumental in our perception of flavors, allowing us to differentiate strawberry from raspberry ice cream and warning us when food is spoiled. It keeps us safe — when we catch a whiff of smoke that signals fire or gas that signals a leak. It’s tied to our memories, transporting us back to a person or place we love.
People dealing with smell dysfunction have scheduled medical appointments, joined support groups and spent months using smell kits to retrain their noses. Universities have launched studies on recovering smell after COVID-19, starting treatment trials using nasal rinses and essential oils.
“Once you have smell, you think it’s there forever,” Castro-Salzman said. “For me, it was like losing something very precious. … It’s like a living nightmare.”
It’s not entirely clear what causes COVID-19-related anosmia (and, later, parosmia), although scientists believe the virus affects supporting cells that are crucial for the healthy function of olfactory neurons — which detect and transmit odorant information to the brain. The Centers for Disease Control and Prevention cites smell and taste problems as a long-term complication.
When Castro-Salzman lost her sense of smell and taste in early March 2020, after attending a concert in Hollywood, her doctors told her it was probably a sinus infection. But a few days after reading an article linking those symptoms to COVID-19, she decided to get tested for the coronavirus. She was positive.
She suffered a headache, body aches and fatigue, although those were short-lived. Her loss of smell and taste lasted almost two months.
It wasn’t until May or June that her senses were back at 50%, she said. The first time she was able to smell again, she cried.
But in July, everything turned upside down once more. Flavored drinks started tasting metallic and rotten. Spices, cilantro and onion suddenly tasted off. She couldn’t eat meat or vegetables if they were grilled. Soon, she’d lost about 10 pounds.
In August, while on location in downtown L.A. for her job as a costumer, everything — the air, the coffee shop, a nearby generator — smelled like burned rubber. The smells were so overwhelmingly bad, she suffered headaches. That night, she went home and sobbed.
“I just felt like nobody understood what I was going through. It’s not like you break a leg and people understand that you can’t walk,” Castro-Salzman said. “I had to explain to them all the weird smells and, like, how depressing [it is] and how much anxiety you get from it.”
Jay Piccirillo, a professor of otolaryngology at Washington University School of Medicine in St. Louis, likens parosmia to wires that have gotten crossed, “like in your house when you turn on the light, the dishwasher goes on.”
Pamela Dalton, who studies smell’s link to cognition and emotion at the Monell Chemical Senses Center in Philadelphia, says the errant smells may actually be an encouraging sign that the olfactory receptor neurons in the nose are trying to restore their proper connections in the brain.
“They don’t always make the right connections” when they’re attempting to regrow, Dalton said. “At that point, you are smelling chocolate and it smells like dirt or manure … I don’t think we really know exactly how long this might go on.”
Nearly a year after getting COVID-19, 27-year-old Stevie Gibbs smells almost nothing at all. The low point was the day she didn’t realize there was a fire in her trash can until she spotted the smoke. The consumption of food, she says, became a matter of sustenance rather than joy.
In June, the Loz Feliz resident met Dr. Wrobel and took a scratch-and-sniff test to determine her degree of smell loss. She couldn’t detect any of the fragrances. Under Wrobel’s advisement, Gibbs began smell training.
The purpose of such training, which has been used for at least a decade, is to stimulate the regenerative capacity of the olfactory system. Twice daily, people will smell a scent and try to recall the memory of it, like picturing cutting lemons while smelling the lemon essential oil.
“Almost like physical therapy for the olfactory nerve,” Wrobel said.
For those dealing with parosmia, Dalton said, smell training “may be able to help reorganize the system the proper way again.” People can pick core sets of scents using something from their spice cabinet, their shampoo or any item they recall prior to the loss.
In addition, there is evidence from olfactory training studies that “the earlier you start, the better the outcome,” Dalton said.
At Washington University School of Medicine, research on smell loss and recovery after COVID-19 is ongoing. The university is currently conducting a clinical trial to see if smell training can help patients with anosmia.
Out of a list of about 34 essential oils, patients will pick the four they want to use to restore connections in the brain. Piccirillo said the most popularly requested smell — one they don’t offer — is smoke.
“It means that for so many people who have lost their sense of smell, the fear of not being able to smell fire is so real,” Piccirillo said.
That danger became clear last month when a Texas teenager evacuated her family as a fire tore through their home. The other family members, all of whom had COVID-19, couldn’t smell the smoke.
Castro-Salzman didn’t start seriously doing smell training until August, at the peak of her parosmia. She made her own kit using makeup jars, putting drops of essential oil onto a paper towel she placed at the bottom of each one.
On a recent afternoon, she closed her eyes and dipped her nose into a jar scented with peppermint essential oil, her hands clasped around it like a cup of coffee she no longer enjoys.
For the 15 seconds she inhaled the scent at her kitchen counter, she visualized peppermint candy and toothpaste, which she’d had to abandon months before because the taste of mint was so awful to her.
She cycled through lemongrass, and thought about Thai food. The orange essential oil made her think of the beach and being able to eat the fruits she once loved. She saved her favorite for last: lavender.
It was the scent that seemed to be closest to reality, the one that reminded her of life pre-parosmia, “when everything just had the real smell.”
It’s a life she desperately hopes to regain.