Pregnancy Complications Linked to Stroke Risk Before Age 50

A study published this week in Neurology, the journal of the American Academy of Neurology, has found that women who experienced complications during pregnancy face a measurably higher risk of stroke before turning 50. The research examined 1,072 women who had been pregnant at least once—358 of whom had suffered an ischemic stroke between ages 18 and 49, and 714 who had not. When researchers compared the two groups, a stark pattern emerged: just over half of the women who had strokes reported at least one pregnancy complication, compared to roughly a third of those without strokes.

The complications in question are specific and well-documented: preeclampsia, the dangerous spike in blood pressure that can occur during pregnancy; preterm birth before 37 weeks; babies born small for their gestational age; gestational diabetes; and pregnancy loss through miscarriage or stillbirth. After accounting for the age at which each woman had her first pregnancy, the researchers found that those who had experienced a stroke were more than twice as likely to have had at least one of these complications. The associations grew sharper when they looked at individual conditions. Women with a history of stillbirth were nearly five times more likely to have had a stroke, though the researchers noted this group was small. Those with preeclampsia were about four times more likely, and women who had delivered prematurely or had small-for-gestational-age births faced roughly three times the risk.

The mechanism appears to involve the arteries themselves. Preeclampsia and preterm birth in particular were associated with strokes caused by large artery disease, a condition often rooted in atherosclerosis—the accumulation of fatty plaque inside blood vessel walls. This suggests that pregnancy complications may signal an underlying vulnerability in the cardiovascular system, one that can manifest as stroke years or even decades later.

Frank-Erik De Leeuw, the study's lead author from Radboud University in the Netherlands, emphasized that while the overall risk of stroke remains low, the findings point to a practical shift in how doctors should approach women's health. "Pregnancy complications may be an early warning sign of stroke risk—even before age 50," he said. "Knowing this history could help doctors identify those who may benefit from early prevention and cardiovascular care." He suggested that physicians should routinely ask about pregnancy history when assessing a woman's stroke risk, and that cardiovascular prevention strategies may need to begin earlier in life than the traditional focus on the postmenopausal years.

The study does not prove that pregnancy complications cause stroke—only that the two are associated. There are also methodological limits worth noting. Some pregnancy complications were reported by the women themselves rather than verified through medical records, which can introduce inaccuracy. The researchers were also unable to adjust for all known stroke risk factors, including high blood pressure and cholesterol levels at the time of the study. These gaps mean the true relationship between pregnancy history and stroke risk remains incompletely understood.

Still, the findings suggest a new lens through which to view women's cardiovascular health. A woman who had preeclampsia or delivered prematurely decades ago may carry an invisible marker of future risk. De Leeuw called for future research into whether lifestyle changes—diet, exercise, stress management—could reduce cardiovascular risk in women with a history of pregnancy complications. The implication is clear: the conversation about a woman's heart health may need to begin not at midlife, but much earlier, anchored in the medical events of her reproductive years.