This disorder is sometimes known as transformed migraine because the migraines are episodic at first.
Over time, the attacks “transform” and become more frequentin some cases almost daily.
Most people with chronic migraine are women, and more than 90 percent have a history ofmigraine with aura.

Illustration by Emily Roberts, Verywell
Symptoms
The primary difference between chronic migraines and episodic migraines is their frequency.
In some cases, the symptoms may become less severe as the migraine transforms from episodic to chronic.
According to the National Headache Foundation, nearly 80 percent of those with transformed or chronic migraine overusemedications.

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There are no lab tests used to diagnose chronic migraine.
Patients typically get injections every 12 weeks.
This may stop your chronic headaches and can make the drugs more effective once you resume taking them.
Your healthcare practitioner can help you find support groups, as can theAmerican Migraine Foundationwebsite.
A Word From Verywell
Chronic migraine is a challenging illness.
National Headache Foundation.Chronic Migraine (Transformed Migraine).
2011 Dec;15(12):1401-20.
Negro A. et al.
Chronic migraine plus medication overuse headache: two entities or not?The Journal of Headache and Pain.
2011 Dec;12(6):593-601. doi: 10.1007/s10194-011-0388-3