Depression is a symptom that is associated with mood disorders. Examples of mood disorders are major depressive disorder (not the same as depression; depression is a symptom of this disorder), bipolar disorder, dysthymia and many more. These mental illnesses have a biological and psychosocial basis.
When a person has any of these disorders, the person will not be able to control their depression by themselves. Depression is like having a cough or cold where it requires proper medical attention for it may be something serious. It is important that we treat people who are experiencing depression with empathy and concern. Together, let’s fight for mental health!
Reference: Sadock, B. J. and Sadock, V. A. 2007. Kaplan & Sadock’s Synopsis of Psychiatry. 10th ed. Philadelphia: Lippincott Williams & Wilkins, a Wolters Kluwer Business.