The number of teen patients with twitching symptoms is growing. The condition may be spreading through the Web.
Nearly 20 teenagers in upstate New York have come down with a strange twitching disorder.
Some parents say an environmental toxin is to blame, but so far tests have come back negative.
Some experts say it may be spreading through social media as a kind of subconscious mimicry.
Doctors treating the strange case of nearly 20 teenagers with a twitching disorder in upstate New York say the symptoms may be spreading faster through the girls' own use of Facebook and other forms of social media.
Experts have diagnosed the problem as a form of mass hysteria in which an individual, usually a young woman, becomes ill during a period of stress, and others in the same community, school or workplace begin to show the same physical symptoms.
Last fall, several girls in the small town of LeRoy, N.Y., began complaining of involuntary facial and body twitching that resembled Tourette's syndrome. Since then, a dozen girls from 13 years to 18 years old have been affected, as well as one boy.