 We know that many teenagers are moody, unpredictable and filled with worry. But how can you tell if the tears will go away, or if they re a sign of something more? In the past year, almost one third of teens said they felt sad or hopeless for at least two weeks in a row. Eighty percent more teenage girls are hospitalized for depression today, compared to just ten years ago. According to a survey from the CDC, one in five teens will consider suicide, and one in ten will make a serious attempt. No matter why they slam the door and shout, experts say there are ways for parents to help teenagers who say "Leave Me Alone!"