There are several diagnoses related to depressive symptoms. A diagnosis will depend upon how long the symptoms have lasted, the severity of the symptoms and what other areas of functioning are being affected.
Major Depressive Disorder
The most severe of the depressive disorders, MDD is characterized by a period of at least two weeks with depressed mood and/or loss of interest in activities. The disorder can also affect appetite, sleep, concentration and self esteem. People with MDD may also have thoughts of harming themselves.
Depressive Disorder NOS
Sharing many of the same symptoms as MDD, Depressive Disorder NOS is generally shorter in duration lasting a few days at most.
Persistent Depressive Disorder
Is characterized by a low level of depressive symptoms that last for at least two years.