Depression is a broad term commonly used by the general public to describe feelings such as sadness, lack of motivation, or low mood. This state may be short-lived and can be related to everyday life events.

Major Depressive Disorder, on the other hand, is a clinically defined diagnosis in psychiatry and is evaluated according to specific diagnostic criteria. In Major Depressive Disorder, a persistently depressed mood lasting at least two weeks, loss of pleasure in life, marked impairment in functioning, and changes in biological functions such as sleep, appetite, and energy are observed.

What Is the Difference Between Major Depressive Disorder and Depression?

In other words, not every feeling of depression qualifies as Major Depressive Disorder; however, Major Depressive Disorder is one of the most severe and persistent forms of depression.

For more detailed information, you may review the article MAJOR DEPRESSIVE DISORDER.