The study prospectively examines the association between a specific chronic life stressor (i.e., intimate violence exposure) and adult asthma in women participating in the Nurses' Health Study II cohort. Emerging epidemiologic data suggest that exposure to intimate violence is a pervasive chronic life stressor associated with adverse impact on womens' psychological and physical health. Traumatic stress such as that related to intimate violence exposure has been associated with neuroendocrine changes known to cause alterations in neuroendocrine and immune functions important to the pathophysiology of inflammatory diseases including asthma. The investigators are testing the hypothesis that women exposed to high-level chronic stress (violence) will be at greater risk for asthma development than women with low-level stress (violence) exposure. The influence of chronic stress on neuroendocrine and immune function as reflected in morning cortisol expression, for the former, and cytokine profiles and IgE production (T-helper cell polarization), for the latter, will also be examined in a nested case control fashion among these women.