(NBC News) A new analysis on teen suicide from the National Center for Health Statistics reveals a disturbing trend.
The suicide rate among teenage girls is climbing quickly, doubling since 2007.
More girls killed themselves in 2015 than any other year in the past four decades.
Dianne Grossman's daughter, Mallory, took her own life earlier this summer.
Related: '13 Reasons Why' tied to rise in teen suicides
"It got to the point where she didn't want to go to school, chronic headaches, stomach aches, not feeling good, um at one point her grades plummeted," Grossman says.
Her parents blame intense bullying at school.
There are no clear reasons for the national increase in youth suicides.
Experts say people in crisis often give warning signs like distinct changes in behavior, withdrawal from activities and isolation from friends and family.
"Any hints of extremely pain, overwhelming pain, trapped, hopelessness, or being a burden...any of that kind of talk are very important to pay attention to," says Dr. Christine Moutier of the American Foundation for Suicide Prevention.
Most importantly, parents should trust their instincts and seek help for children exhibiting signs of depression.
