The reasons why migraine is linked to clotting and cardiovascular disease aren't known, Rosen said.
"Women making the decision to be on a hormonal contraceptive should discuss their headache history with their doctor," he added.
The data and conclusions of research presented at medical meetings should be considered preliminary until published in a peer-reviewed journal.
More information
For more on migraine, visit the U.S. National Library of Medicine.
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