Health locus of control and use of conventional and alternative care: a cohort study.

Background: Health locus of control influences health-related behaviour, but its association with healthcare use is unclear.

Aim: To investigate the association between individuals' health locus of control and the use of conventional and alternative health care.

Design Of Study: Prospective cohort study.

Setting: A nationally representative random sample of community-dwelling adult households in Japan.

Method: Health locus of control, symptom-related visits to physicians, and the use of dietary and physical complementary and alternative medicine (CAM) was measured. Dietary CAM included supplements, such as herbs and vitamins. Physical CAM included manipulations, such as acupuncture and acupressure.

Results: Of the 2453 adult participants studied, 2103 (86%; 95% CI [confidence interval] = 84 to 88%) developed at least one symptom during the 31-day study period. Of these symptomatic adults, 639 visited physicians (30%; 95% CI = 28 to 32%), 480 used dietary CAM (23%; 95% CI = 21 to 25%), and 156 (7%; 95% CI = 6 to 9%) used physical CAM. The likelihood of visiting a physician was not related significantly to individuals' health locus of control. Increased use of dietary CAM was weakly associated with control by spiritual powers (P = 0.028), internal control (P = 0.013), and less control by professionals (P = 0.020). Increased use of physical CAM was significantly associated with control by spiritual powers (P = 0.009) indicating a belief that supernatural forces control individuals' health status.

Conclusion: The likelihood of visiting a physician is not affected by individuals' health locus of control. Control by spiritual powers is involved with increased CAM use. Internal control is weakly associated with greater use of dietary CAM; professional control is weakly associated with less use of dietary CAM.