Information provided by the American Psychiatric Association outlines the various subtypes of depression. These include:
Anxious distress — depression with unusual restlessness or worry about possible events or loss of control
Mixed features — simultaneous depression and mania, which includes elevated self-esteem, talking too much and increased energy
Melancholic features — severe depression with lack of response to something that used to bring pleasure and associated with early morning awakening, worsened mood in the morning, major changes in appetite, and feelings of guilt, agitation or sluggishness
Atypical features — depression that includes the ability to temporarily be cheered by happy events, increased appetite, excessive need for sleep, sensitivity to rejection, and a heavy feeling in the arms or legs
Psychotic features — depression accompanied by delusions or hallucinations, which may involve personal inadequacy or other negative themes
Catatonia — depression that includes motor activity that involves either uncontrollable and purposeless movement or fixed and inflexible posture
Peripartum onset — depression that occurs during pregnancy or in the weeks or months after delivery (postpartum)
Seasonal pattern — depression related to changes in seasons and reduced exposure to sunlight. This is often referred to as Seasonal Affective Disorder.