Johann Christian August Heinroth

Johann Christian August Heinroth (17 January 1773 – 26 October 1843) was a German physician who was the first to use the term psychosomatic. Heinroth divided the human personality into three personality types in his scholarly papers and published books in the 1800s, describing the Uberuns (conscience), the ego (mind, emotions and will) and the Fleish (basic drives, which included man's sinful nature).

Heinroth was born in Leipzig. He initially studied medicine there, later continuing his education in Vienna under Johann Peter Frank (1745–1821). After briefly studying theology in Erlangen, he returned to Leipzig, where in 1805 he obtained his medical doctorate. In 1806 he became a lecturer at the University of Leipzig, where in 1827 he was appointed a full professor of physical medicine.

Heinroth is largely remembered for seminal work done in the field of psychiatry. His views on psychiatric thought have been described as a combination of anthropology and holistic medicine. He believed that the soul had primacy over the body, and that the body and soul interacted in several ways. Consequently, mental sickness and many somatic illnesses are caused by the soul. In 1818 he introduced the term "psychosomatic" into medical literature.

Heinroth regarded sin as a cause of mental illness. His description of sin came from a 19th-century Protestant standpoint, and was also derived from an accepted European code of ethics and morality. His definition of sin wasn't based on a singular event, but rather as a period of several years of an individual striving towards earthly, bodily satisfaction. From a philosophical point of view, Heinroth espoused the teachings of Johann Gottfried Herder (1744–1803).

In his 1818 textbook Störungen des Seelenlebens he classified mental disorders into different categories. The three main categories were named the exaltations, the depressions and the "mixed states" (Mischung) of exaltation and weakness. He further divided the mixed states category into subcategories called 'mixed mood disorders', 'mixed mental disorders' and 'mixed volition disorders'.

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