We often use the expression "I feel depressed" when we’re feeling sad or miserable about life. Usually, these feelings pass in due course.

 

However, if the feelings are interfering with your life and don't go away after a couple of weeks, or if they come back, over and over again, for a few days at a time, it could be a sign that you're depressed in the medical sense of the term.

 

In its mildest form, depression can mean just being in low spirits. It doesn’t stop you leading your normal life, but makes everything harder to do and seem less worthwhile. At its most severe, major depression (clinical depression) can be life-threatening, because it can make you feel suicidal or simply give up the will to live