It was blinding headaches that sent the 46-year-old New Yorker running to her doctor.
Alarmed, her physician did blood work and ordered an expensive MRI of the brain, as well as another kind of brain scan. Everything checked out as normal. There was no apparent explanation for the sudden pounding in the patient's head, a pounding that was not eased by medications.
Stumped, the doctor sent her to a neurologist, Dr. Orly Avitzur of Terrytown, N.Y., who finally unraveled the mystery.
"When I went to examine her and simply touched her scalp, she pulled away and winced when my fingertips touched her quite gently," Avitzur said, describing the unnamed patient, a social worker.
Avitzur took a closer look and noticed something unusual.
"She had hundreds of these tightly braided hair braids," she said.
It turns out the woman was suffering not from a neurological condition, but from a side effect of her new hair extensions. She'd gotten the popular beauty treatment a few weeks earlier, right at the time the headaches began.
"It was pretty clear to me that she did not need a work-up," Avitzur said, "but that she needed to remove her extensions."
Avitzur, who is also the medical adviser for Consumer Reports, has now written an article warning about the dangers of hair extensions, which go beyond headaches. Avitzur warns about permanent hair damage, and even a kind of baldness called traction alopecia, caused by the pulling and weight of the extensions.
"I think the risk of baldness, if you start to get hair loss, that's really my bottom line," Avitzur said, "then stop immediately."
Hair extensions first became popular with actresses and other celebrities, some of whom are now reportedly suffering from their own hair loss as a result of the extensions. The procedure, which can add fullness and length to a head of hair, is now solidly mainstream.
"Very popular, huge," longtime Chicago cosmetologist Grace Santiler-Nowik said, adding that the extra tresses are safe if put-in and cared for correctly.
"It's not something you tread into lightly," she told ABC News. "People want their hair thick and long, but they forget there's a whole upkeep portion of it they have to maintain."
It's important to make sure the stylist has experience with the kind of hair extensions you're using, and with the method they're using to attach the extensions. If they're attached too tightly, or weigh too much, problems can develop, according to Santiler-Nowik, who is president of the Professional Beauty Association's Professional Council.
Santiler-Nowik also warns that customers have to return to the salon at regular intervals to have the extensions removed and replaced, and need to take a break from the hair pieces if they're causing damage to a person's hair.
"I think it's important for people to get education, there's always a safe way to do things and a smart way to do things," she said.
It was a beauty pageant that led 26-year-old Amanda Jones to try hair extensions. She used them for two Miss Virginia competitions.
Jones, who finished in the top five both times, had wildly different experiences. The first time around, she had the extensions glued to her own hair, and said there were no problems. Last year, she tried a different method; the extensions were sewn onto her own hair.
"That was the most painful experience of my life," Jones said. "I had them in for maybe three weeks. My scalp was red and bleeding. I lost a lot of hair."