1 In 12 Teens Deliberately Cut, Hurt Themselves

At age 14 or 15, a perfect storm of surging hormones, immature brains and unfamiliar emotions drive nearly one in 12 teens to deliberately hurt themselves, most often by cutting or burning their own flesh, or by trying to hang, electrocute, drown or suffocate themselves.

"The window of vulnerability for this experience of self-harm appears to open at around puberty," said Dr. Paul Moran, co-author of a study about self-harm published online Wednesday in The Lancet.

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