In general we recognize the following types of depression: Primary: Unipolar

• Mixed anxiety and depressive disorder - with prominent anxiety
• Depressive episode - single episode
• Recurrent depressive disorder - recurrent episodes
• Dysthymia - persistent and mild (depressive personality)

Bipolar:

• Bipolar affectve disorder - with manic episodes ("manic depression")
• Cyclothymia - instability, frequently changing episodes of mild depression and mild mania, persistent irritability of mood

Other primary:

• Seasonal affective disorder
• Brief recurrent depression

Secondary: May be secondary to medical condition, (physical or psychiatric) or alcohol ar other drugs. Depressive episode: Each episode may be:

• Moderate or severe.
• With or without somatic syndrome
• If severe, with or without psyhotic symptoms.