The influence of reproductive factors on migraine in premenopausal women: A nationwide population-based study in South Korea

Abstract

Abstract Sex hormones significantly impact the risk and pattern of migraine in women. Women experience various hormonal changes associated with pregnancy, childbirth, breastfeeding, and contraception. This study investigated the influence of reproductive factors on migraine in women. We used the linked Korean National Health Insurance Service (KNHIS) and Korean Health Examination (KHE) databases. Reproductive factors were defined as parity, breastfeeding, and oral contraceptive use. This study enrolled 1,059,579 premenopausal women. The study population was divided into two groups depending on whether the patient was newly diagnosed with migraines during the follow-up period (2009–2018). The risk of migraine tended to increase in the primiparous (HR: 1.175; 95% CI: 1.136–1.215) and multiparous groups (HR: 1.197; 95% CI: 1.161–1.235) compared to the nulliparous group. Breastfeeding (6–12 months, HR: 1.047; 95% CI: 1.029–1.066, and ≥ 12 months, HR: 1.104; 95% CI: 1.085–1.123) significantly increased migraine risk compared with not breastfeeding. All women in the oral contraceptive groups (< 1 year, HR: 1.048; 95% CI: 1.028–1.069 and ≥ 1 year, HR: 1.102; 95% CI: 1.069–1.136) showed a higher risk compared with the non-oral contraceptive group. Our study suggests that the experience of childbirth, longer breastfeeding, and oral contraceptive use may be associated with higher migraine risk in premenopausal women.