Unipolar and bipolar depression
If the predominant feature is a depressed mood, it is called unipolar depression. However, if it is characterized by both manic and depressive episodes separated by periods of normal mood, it is referred to as bipolar disorder (previously called manic depression). Unipolar depression can involve anxiety and other symptoms – but no manic episodes. However, research shows that for around 40 percent of the time, individuals with bipolar disorder are depressed, making the two conditions difficult to distinguish.
Major depressive disorder with psychotic features
This condition is characterized by depression accompanied by psychosis. Psychosis can involve delusions – false beliefs and detachment from reality, or hallucinations – sensing things that do not exist.
Women often experience ‘baby blues’ with a newborn, but postpartum depression – also known as postnatal depression – is more severe.
Major depressive disorder with seasonal pattern
Previously called as Seasonal Affective Disorder (SAD), this condition is related to the reduced daylight of winter – the depression occurs during this season but lifts for the rest of the year and in response to light therapy.