What was previously known as melancholia and is now known as clinical<unk> , major<unk> , or simply<unk>  and commonly referred to as major depressive disorder by many health care professionals, has a long history, with similar conditions being described at least as far back as classical times.
History of depression
History of psychotherapy
History of psychosurgery
History of bipolar disorder
History of chronic fatigue syndrome
History of mental disorders
History of herbalism
History of chemical warfare