Occasionally, everyone feels sad or blue, but these feelings are usually temporary and only last a few days. If these feelings last for an extended period of time and interfere with normal functioning and daily life you may be suffering from depression disorder. It is a common but serious illness, and most who experience it need some form of help or treatment to get better and that is not a bad thing. There are several forms of depressive disorders and there are medications, therapies and self-help techniques that have proven to be very effective in the treatment of depression. Never be afraid to learn.