Everybody gets the blues. Who hasn't felt sad at one time or another?
But what if the blues hang on and on, affecting you day after day? What if a persistent sadness permeates all aspects of your life your ability to perform, how you eat, how you sleep, and how you deal with friends and family? Then, depression may have you in its grip.
Depression can be sneaky. If you experience symptoms of depression for more than two weeks, it's wise to talk to your doctor or a mental-health professional even if you think the symptoms are caused by something else.