They Had Mild Covid. Then Their Serious Symptoms Kicked In.

A new study illuminates the complex array of neurological issues experienced by people months after their coronavirus infections.

Samar Khan expected to recover fully from a mild case of Covid-19, but before long her symptoms multiplied, including a “really intense brain fog.”Credit…Taylor Glascock for The New York Times

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By Pam Belluck

In the fall, after Samar Khan came down with a mild case of Covid-19, she expected to recover and return to her previous energetic life in Chicago. After all, she was just 25, and healthy.

But weeks later, she said, “this weird constellation of symptoms began to set in.”

She had blurred vision encircled with strange halos. She had ringing in her ears, and everything began to smell like cigarettes or Lysol. One leg started to tingle, and her hands would tremble while putting on eyeliner.

She also developed “really intense brain fog,” she said. Trying to concentrate on a call for her job in financial services, she felt as if she had just come out of anesthesia. And during a debate about politics with her husband, Zayd Hayani, “I didn’t remember what I was trying to say or what my stance was,” she said.

By the end of the year, Ms. Khan was referred to a special clinic for Covid-related neurological symptoms at Northwestern Memorial Hospital in Chicago, which has been evaluating and counseling hundreds of people from across the country who are experiencing similar problems.

Now, the clinic, which sees about 60 new patients a month, in-person and via telemedicine, has published the first study focused on long-term neurological symptoms in people who were never physically sick enough from Covid-19 to need hospitalization, including Ms. Khan.

The study of 100 patients from 21 states, published on Tuesday in The Annals of Clinical and Translational Neurology, found that 85 percent of them experienced four or more neurological issues like brain fog, headaches, tingling, muscle pain and dizziness.

“We are seeing people who are really highly, highly functional individuals, used to multitasking all the time and being on top of their game, but, all of a sudden, it’s really a struggle for them,” said Dr. Igor J. Koralnik, the chief of neuro-infectious diseases and global neurology at Northwestern Medicine, who oversees the clinic and is the senior author of the study.

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