Feeling down or blue is a natural part of life. People let us down, things go wrong, we lose people we love or the dreams we've valued. When feeling down stretches over weeks or months or is occurring frequently and interfering with your ability to interact with people and enjoy your life, it is likely that you're experiencing some form of depression. Provided that you're able to access information, medical professionals, and support networks around you, even severe depression is a highly treatable condition. But no matter what, take matters into your own hands and take action if you are depressed.