It’s thought that CBD might affect your health by attaching to receptors in the body’s endocannabinoid system—a complex biological system involved in maintaining certain aspects of your health. Emerging research shows that endocannabinoids may play a role in regulating such functions as memory, sleep, and mood, as well as metabolic processes like energy balance. In addition, CBD oil may play a role in improving a variety of health conditions.
Pharmacology published a study in 2016 looking at medical marijuana for migraines, specifically in relation to its effects on serotonin, with very positive results. You’ll notice that neither study looked at CBD in isolation from other cannabinoids (which is an issue with a lot of research on CBD and pain). Truthfully, the research on CBD alone just isn’t sufficient to make any pronouncements about its effects on headache pain. 
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