Depression is classified as a mood disorder. It may be described as feelings of sadness, loss, or anger that interfere with a person’s everyday activities.
Though depression and grief share some features, depression is different from grief felt after losing a loved one or sadness felt after a traumatic life event. Depression usually involves self-loathing or a loss of self-esteem, while grief typically does not.
In grief, positive emotions and happy memories of the deceased typically accompany feelings of emotional pain. In major depressive disorder, the feelings of sadness are constant.
People experience depression in different ways. It may interfere with your daily work, resulting in lost time and lower productivity. It can also influence relationships and some chronic health conditions.