The Prevalence and Level of Awareness of Medication Overuse Headache in Qassim Province, Saudi Arabia: A Cross-Sectional Study.

Introduction Medication overuse headache (MOH) is a secondary headache caused by regular overuse of medication(s) intended to relieve (notably, not prevent) the symptoms of a pre-existing primary headache (most commonly, migraine and tension headaches). MOH places a considerable burden on both patients and society. Understandably, the disorder is the subject of many cross-sectional studies worldwide.