In the US differences between socioeconomic groups increased between 1960 and 1986. Data such as individual health behaviors demonstrate clear patterns of socioeconomic variation. Theories suggest that personal control over one s life is an important factor in differences along with increased susceptibility, and environment. Lack of access to medical care and lower quality of care are important factors. Health care and social welfare policies are inextricably linked.
Illness can cause a downward social drift.