Background
migraine, chronic headache disorders
MIGRAINE, MEDICATION OVERUSE HEADACHE, CHRONIC HEADACHE, TENSION TYPE HEADACHE
The Chronic Headache Education and Self-Management Study (CHESS) multicentre randomised trial evaluated the impact a group education and self-management support intervention with a best usual care plus relaxation control for people living with chronic headache disorders (tension type headaches or chronic migraine, with or without medication overuse headache). Here we report the process evaluation exploring potential explanations for the lack of positive effects from the CHESS intervention.