Medication overuse headache and substance use disorder: A comparison based on basic research and neuroimaging

Area of Science:

• Neuroscience
• Neurology
• Addiction Research

Background:

• Medication overuse headache (MOH) is a complex condition, with its independent disorder status or relation to primary headache and substance addiction debated.
• Understanding the neurobiological underpinnings of MOH is crucial for developing targeted treatments.

Purpose of the Study:

• To investigate the potential shared neurobiological mechanisms between medication overuse headache (MOH) and substance use disorders (SUDs).
• To compare brain region involvement in MOH and alcohol use disorder (AUD) as a representative SUD using neuroimaging and basic research.
• To identify potential therapeutic targets for both addiction and headache symptoms in MOH patients.

Main Methods:

• A comprehensive review of existing neuroimaging and basic research studies comparing medication overuse headache (MOH) and alcohol use disorder (AUD).
• Analysis of overlapping and distinct brain regions implicated in both conditions, focusing on the reward circuit and cerebral cortex.
• Identification of key brain areas for future research and potential therapeutic interventions.

Main Results:

• Significant overlaps were observed between AUD and MOH within the brain's reward circuitry.
• Neuroimaging studies revealed more extensive and severe cerebral cortex damage in AUD compared to MOH.
• This difference suggests a differential sensitivity of cortical structures to the damaging effects of alcohol versus medication overuse.

Conclusions:

• Medication overuse headache (MOH) and alcohol use disorder (AUD) share common neural pathways, particularly in reward circuits.
• Distinct patterns of cerebral cortex involvement highlight differing neurobiological impacts, with AUD exhibiting more pronounced damage.
• Future research focusing on the central amygdala, prefrontal cortex, orbital-frontal cortex, and hippocampus may yield novel interventions for MOH, addressing both addiction and headache components.