Not sure whether you've got the Monday blues or there's something more serious going on? Depression affects more than a quarter of a billion people around the world, and it often goes undiagnosed. Knowing the signs and symptoms to look for can help you decide when it may be time to seek help.

Defining depression

Depression, also called major depressive disorder or clinical depression, is a mood disorder that negatively impacts the way you feel, think and act, with myriad negative effects on both physical and mental health. Depression is more than just feeling down in the dumps. It's an ongoing, persistent feeling of sadness, emptiness and loss of joy in doing activities that can significantly impact day-to-day function. There are different types of depression. Sufferers often endure it for many years, and it typically ebbs and flows. Depression is linked to anxiety and even suicidal thoughts.

Fortunately, depression