A lot of mental health disorders like bipolar disorder are thought to just be extreme cases of the normal aspects of thinking. Researchers talk about spectrums. Everyone has ups and downs in their mood. People with bipolar disorder have extreme low (depression) and high (mania) moods that last a long time. You can read more about bipolar disorder here: http://www.nhs.uk/Conditions/Bipolar-disorder/Pages/Introduction.aspx
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