Cannabinoids such as CBD work beneficially in a synergistic way with terpenes, flavonoids and many other components of the plant to create the overall finished therapeutic results. Different combinations create different effects. This is the exact reason why certain strains work better for certain conditions and others may not work at all. Medical cannabis plants tend to have a more diversive pronounced terpene profile when compared with most hemp strains. Also when you go the medical route you have access to higher contents of THC which many times can be a great cannabinoid to help treat many conditions.