About 60% of women with migraine note an increased number of headaches in association with their menstrual period. In 10% to 14% of these women, the migraine occurs around the time of the period and at no other time. The term “menstrual migraine” is often used to describe this type of migraine, but the term is not used consistently and it lacks a universally accepted definition. Many headache authorities think the term “menstrual migraine” should be restricted to migraines that occur in women that experience 90% of all their attacks between the two days before and the last day of their menstrual periods.