WORLD HEALTH ORGANIZATION ESTIMATES... By 2020, depression will be the #1 cause of disability worldwide. We all go through spells of feeling down, but when you're depressed you feel persistently sad for weeks or months, rather than just a few days.
Depression is a real illness with real symptoms, and it's not a sign of weakness or something you can "snap out of" by "pulling yourself together". The severity of the symptoms can vary. At its mildest, you may simply feel persistently low in spirit, while at its most severe depression can make you feel suicidal and that life is no longer worth living.
The good news is that with the right treatment and support, most people can make a full recovery.
It's important to seek help if you think you may be depressed.