Migraine and haemostasis.

Migraine is a risk factor for cerebral infarction in young women. The nature of the connection between these diseases remains however essentially unknown. Abnormalities of haemostasis leading to an increased thrombotic risk would provide a logical link. Platelets, antiphospholipid antibodies and more recently congenital thrombophilia have thus successively been implicated. The different studies concerning these topics have been reviewed. Because of the conflicting results obtained and because of the numerous methodological shortcomings of many of these studies, no definite conclusion can be reached. It is possible that these 3 factors play a role in the ischemic risk of migraine, but it is as likely or even more likely that other factors (inside or outside the hemostatic system) play a more important role. Further studies are thus deeply needed.