«Most of the patients we see in a headache center with daily headache have medication - overuse, or rebound, headaches,» says Stewart Tepper, MD, director of research at the Center for Headache and Pain at the Cleveland Clinic Neurological Institute. (health.com)
4 - 5 % of the population get Chronic Daily Headache (CDH)- defined as a headache at least 15 days / month lasting at least 4 hours per episode. (bookbrowse.com)
I still experienced daily headaches much of the time, and still had severe migraines with nausea and vomiting which necessitated trips to the ER. (globalhealingcenter.com)