Depression or Bipolar

How do you know if you have depression or if you are bipolar? Sometimes I am not sure any more. Is there a possibility of having both?

Depression is part of bipolar. Bipolar means that you sometimes suffer from depression and sometimes from mania. There are many forms and degrees of mania and depression. As far as i know, only psychiatrists can diagnose the condition, based on having suffered through both depression and mania. You should google bipolar on your computer for the symptoms. This is a great site. Stay on and you will learn a lot. Also,read through the old forums. Good luck!