The top comments here are great. 

However, I don't see any comments that regard bipolar disorder or cyclothymia or related mood disorders. For those who don't know, these mood disorders are when a person falls into a depression for a period of time and then experiences mania or hypomania, which is a period of extreme euphoria, happiness, motivation, and other 'good' symptoms. It's caused by a hormonal change in your brain. 

Bipolar disorder and related mood disorders can easily and often be misdiagnosed as 'regular' depression. And in that case an SSRI or anti depressant will be prescribed. SSRIs are not the proper course of pharmaceutical treatment for these mood disorders and more often than not can send someone's hormones into a worsening state of irrational dispersion. For example, the SSRI will only make the periods of change between depressed and manic much more severe, which can result in suicidal ideology. A lot of time these symptoms can be used to distinguish the difference between regular depression and an atypical mood disorder. 

I'm half asleep, so if anyone can reply to me with a better well written comment please do so.