Lesch-Nyhan Syndrome (LNS) is a genetic disorder that results in a deficit in the hypoxanthine-guanine phosphoribosyltransferase (HPRT) enzyme, which affects purine metabolism. It is a genetic disorder that is carried by an X-linked recessive gene. LNS has 3 typical symptoms. These are increased uric acid, neurological symptoms and behavioral disorders. Dystonia is often seen among its neurological manifestations. Signs of primidal and extraprimidal system can be seen. It is very important to create the syndrome-specific physiotherapy program. In order to achieve this, evaluations based on the International Classification of Functioning, Disability and Health (ICF) model are valuable in terms of showing the right way in the management of the disease.