Lesch-Nyhan syndrome: A rare disorder that causes people to move uncontrollably and unintentionally hurt themselves.

Patients with Lesch-Nyhan syndrome often engage in self-harm, including biting their fingers. (Photo by Paulo Souza via Getty Images) Disease name: Lesch-Nyhan syndrome Affected populations: Lesch-Nyhan syndrome is an extremely rare genetic disorder that causes metabolic abnormalities and predominantly affects…




