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All teens experience sadness.
Frustrations, disillusionment, the first heart break and hormones running amok are bound to sadden the gladdest of hearts on occasion. However, some teens experience a sadness that goes deeper, lasts longer and weighs heavier. This deeper, darker sadness is depression. Depression is one of the most common disorders among adolescents and it's symptoms manifest themselves in many ways. Several studies have shown that adolescents suffering from depression show increased aggressive tendencies.