Clinical Vampirism [Wikipedia]

Clinical vampirism, more commonly known as Renfield's syndrome, is an obsession with drinking blood. The earliest presentation of clinical vampirism in psychiatric literature was a psychoanalytic interpretation of two cases, contributed by Richard L. Vanden Bergh and John. F. Kelley. As the authors point out, over 50,000 people addicted to drinking blood have appeared in the psychiatric literature from 1892 to 2010.[vague] This was documented in the work of Austrian forensic psychiatrist Richard von Krafft-Ebing. Many medical publications concerning clinical vampirism can be found in the literature of forensic psychiatry, with the behavior being reported as an aspect of extraordinary violent crimes.
https://en.wikipedia.org/wiki/Clinical_vampirism

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