The diagnostic criteria have experienced a lot of improvements and revisions in the history, including the earliest informal Ekbom’s “criteria” for RLS in 1960, then DCSAD restless legs DIMS or DOES syndrome – essential features in 1979, ICSD diagnostic criteria for RLS in 1990, IRLSSG “minimal” criteria for diagnosis of RLS in 1995 and NIH/IRLSSG (NIH) “essential” criteria for diagnosis of RLS in 2003 (Allen et al., 2014). On the basis of previous diagnostic criteria, the four essential diagnostic criteria of RLS published by NIH/IRLSSG in 2003 emphasized the importance of the urge to move the legs in diagnosing RLS. The four essential criteria are shown below (Table 1).