Most Common Types of Depression in America: Major Depressive Disorder (clinical depression): The most common mental disorder in the United States with about 20% of all teens experiencing it before they reach adulthood Persistent Depressive Disorder (dysthymia): Chronic low-level depression that that is lower in severity than major depression and lasts for at least one year. Between 10 and 15% of teens suffer from this disorder. Manic Depressive Disorder (bipolar disorder): A mental health condition that causes extreme mood swings that include high emotions and lows. It is estimated that 2.9% of adolescents suffer from this disorder. While these are the most common types of depression amongst teens in America, there are many more types of depression. You can learn more about the different types of depression at https://www.webmd.com/depression/guide/depression-types#1 or https://www.healthline.com/health/types-of-depression#major-dep...