A new study indicates that women who are suffering from epilepsy have a greater chance of dying suddenly from childbirth.

The study, published in the journal JAMA Neurology, found that women who have epilepsy can expect a death rate of 80 per 100,000 pregnancies — a massive increase from the standard six deaths per 100,000 for those without it, according to a Business Insider report.

The findings indicate that women who have epilepsy should get increased medical attention during pregnancy, the study researchers — lead author Sarah MacDonald from Harvard T.H. Chan School of Public Health and others — stated according to the report.

Of about 4.2 million delivery-rated discharges the study examined, about 14,151 of the pregnant women had epilepsy.

And it wasn’t just a higher rate of death that pregnant women should be concerned about. Women with epilepsy are also at a higher risk of preterm labor, stillbirth, and pre-eclampsia.

But the study was incomplete: researchers don’t have access to the ultimate causes of death during delivery for epilepsy sufferers, a big data point that would have shed far more light on the issue. As a result, the authors wrote that further research will be needed to fully understand the issue.

Epilepsy involves excessive and abnormal brain activity. Specifically, it is a neurological disorder that often results in seizures, which can be brief and undetectable or it can last over longer periods and include vigorous shaking. Those who suffer from epilepsy tend to have recurring seizures, and the underlying cause typically isn’t readily available. The cause of most cases is unknown to scientists, although it has been linked to brain injuries, strokes, and drug use.