| Summary: | Background: Unsecured debt — debt not tied to an asset — is a financial stressor that undermines health, but prior research has not investigated relationships between group-based trajectories of unsecured debt and pain and disability at midlife. Methods: US respondents of the National Longitudinal Study of Youth-1979 cohort reported unsecured debt and income between ages 28–40. We used these measures to identify group-based trajectories of unsecured debt and unsecured debt-to-income ratio. We then used trajectory membership to predict three pain and disability-related health outcomes at age 50, adjusting for lagged health and other covariates. Results: Group-based trajectory models divided the sample of 7850 respondents into 6 unsecured debt trajectories and 5 unsecured debt-to-income trajectories. In fully adjusted unsecured debt models, compared to people with constant low debt, those who paid down debt over time, carried constant debt, experienced debt cycling, or accumulated debt later in life were more likely to report pain interference with activities or joint pain or stiffness at age 50 (pain interference ORs ranging from 1.33 to 1.76; joint pain or stiffness ORs ranging from 1.27 to 1.45). In fully adjusted unsecured debt-to-income models, compared to those with constant low debt, those with constant high debt or accumulating debt later in life were more likely to report pain interference or joint pain or stiffness (pain interference ORs ranging from 1.30 to 1.91; joint pain or stiffness ORs ranging from 1.19 to 1.33). Conclusion: The amount, timing, and duration of unsecured debt accumulation and repayment have important health implications and may exacerbate midlife health inequalities.
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