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The human body has an endocannabinoid system (ECS) that receives and translates signals from cannabinoids. It produces some cannabinoids of its own, which are called endocannabinoids. The ECS helps to regulate functions such as sleep, immune-system responses, and pain.
When THC enters the body, it produces a "high" feeling by affecting the brain's endocannabinoid receptors. This activates the brain's reward system, producing pleasure chemicals such as dopamine.
According to one study posted to Neurotherapeutics, this is because CBD itself does very little to the ECS. Instead, it activates or inhibits other compounds in the endocannabinoid system.
For example, CBD stops the body from absorbing anandamide, a compound associated with regulating pain. So, increased levels of anandamide in the bloodstream may reduce the amount of pain a person feels.
Cannabidiol may also limit inflammation in the brain and nervous system, which may benefit people experiencing pain, insomnia, and certain immune-system responses.