Everyone occasionally feels blue or sad. But these feelings are usually short-lived and pass within a couple of days. When one has depression, it interferes with daily life and causes pain for both the person and those who care about him/her. Depression is a common but serious illness.
Many people with a depressive illness never seek treatment. But the majority, even those with the most severe depression, can get better with treatment. Medications, psychotherapies, and other methods can effectively treat people with depression.
You are not depressed when you feel sad for a day or two; you are depressed when you experience a prolonged period of sadness that interferes with your ability to function. Depression occurs because of an imbalance of chemicals in the brain. It is an illness. And it is highly treatable