(Malaysia) an episode of sudden and intense anxiety that the penis (or in the rare female cases, the vulva and nipples) will recede into the body and possibly cause death. The syndrome occasionally occurs in local epidemics. This syndrome occurs throughout south and east Asia under different names: suo yang (China); jinjinia bemar (Assam); and rok-joo (Thailand). It has been identified in isolated cases in the United States and Europe, as well as among diasporic ethnic Chinese or Southeast Asians. Click here for a more extensive discussion of shuk yang and koro.