Restless leg syndrome is typically genetic, about 60% of the way genetic. So it runs in families. Most people will be diagnosed before they're 20. At least they'll have symptoms before they're 20, but since it does run in families, people normalize it since their mother or sister has the same condition. They think this is what everybody must be like, but some people develop restless leg syndrome later in life due to a secondary condition such as Parkinson's disease or iron deficiency pregnancy. Also it's greatly associated with renal disease, kidney disease.