There are different types of depression with varying severity of symptoms and longevity . Some may only appear in episodes while others stay around for life. Types of depression include major depression, dysthymia, bipolar disorder , seasonal affective disorder, psychotic depression , postpartum depression , situational depression and atypical depression.

Dysthymia, or chronic depression, is a type of depression – although mild – that lasts a long time. At any given moment at least three percent of the population suffers from dysthymia, and over a lifetime six percent of the population may suffer from a depressive disorder.

Read more at http://www.belmarrahealth.com/dysthymia-causes-symptoms-and-treatment/

Also http://www.belmarrahealth.com/infographics/infographic-depression-facts-...

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