depressive disorder
clinical depression
depression ***

Clinical depression kept her out of school for more than a year.

Some people have clinical depression only once in their life.

I entered a state which would today be called clinical depression.

Clinical depression can be caused by many factors in a person's life.

For much of his life he suffered from clinical depression.

Nancy began to think that he was in a clinical depression.

There's a big difference between feeling blue once in a while and suffering from clinical depression.

Field went public about his experience with clinical depression in mid-2007 to draw more attention to the condition.

He had been diagnosed with clinical depression about ten years earlier.

The aim of the research was to produce clinical depression.