Episodic migraine (EM) is when a person has migraine symptoms for 14 days or less in one month, while chronic migraine (CM) is when a person has migraine symptoms for 15 or more days in one month. When compared to persons with episodic migraine, those with CM where less likely to have full-time jobs and had a larger risk of headache-related disability. Persons with CM are almost twice as likely to have anxiety, chronic pain, and/or depression; they also have a 40% greater chance of having heart disease and angina and are 70% more likely to have a history of stroke.
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