Melancholia or melancholy (Ancient Greek: μελαγχολία, romanized: melancholía; from μέλαινα χολή, mélaina cholḗ, 'black bile') is a concept found throughout ancient, medieval, and premodern medicine in Europe that describes a condition characterized by markedly depressed mood, bodily complaints, and sometimes hallucinations and delusions. Besides a pathological condition, melancholy could also refer to a mood or temperament and at times it was even used as a description of the human condition in general.
Melancholy (or more precisely the 'black bile', from which melancholy derives its name) was regarded as one of the four temperaments matching the four humours. Until the 18th century, doctors and other scholars classified melancholic conditions as such by their perceived common cause – an excess of a notional fluid known as "black bile", which was commonly linked to the spleen. Hippocrates and other ancient physicians described melancholia as a distinct disease with mental and physical symptoms, including persistent fears and despondencies, poor appetite, abulia, sleeplessness, irritability, and agitation. Later, fixed delusions were added by Galen and other physicians to the list of symptoms. In the Middle Ages, the understanding of melancholia shifted to a religious perspective, with sadness seen as a vice and demonic possession, rather than somatic causes, as a potential cause of the disease.
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