Approximately 641,000 children spend some time in foster care each year. Most enter care because they have experienced neglect or abuse by their parents. Between 35% and 60% of children entering foster care have at least one chronic or acute physical health condition that needs treatment. As many as one-half to three-fourths show behavioral or social competency problems that may warrant mental health services. A national survey of children adopted from foster care found that 54% had special health care needs. Research on youth who aged out of foster care shows these young adults are more likely than their peers to report having a health condition that limits their daily activities and to participate in psychological and substance abuse counseling.