Chronic Pain is "an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage." (International Association for the Study of Pain)
"In people with chronic pain, nerve cells can keep on sending pain signals to the brain even in the absence of injury." (The Global Pain Crisis: What Everyone Needs to Know, Judy Forman, 2017.)
Tip: Try using the advance search option within your chosen database and add "chronic pain" or "pain" to the search terms (Example: Cannabinoids AND chronic pain)
Note: Marijuana is an Americanized term for cannabis often depicting the legal or illegal aspect of the Cannabis / hemp plant. Cannabis is a term used more frequently in other countries in reference to its medical/therapeutic attributes.
Another noteworthy tip: Marijuana (Cannabis) is illegal under Federal Law. Therefore, clinical studies are (research is) limited in the United States. However, in countries where cannabis (marijuana) is legal, research regarding the therapeutic effect (positive or negative) is conducted and often published. So, try adding the name of a country where it is legalized for, potentially, additional information. (Example: Cannabinoids AND chronic pain AND Israel)
Cannabinoids (CBD)
Cannabinoids AND therapeutic potential (or therapeutic cannabis)
CBD
Inflammation AND cannabis (Inflammation AND marijuana)
Cannabis and pharmacology
Palliative care
Types of pain:
Cannabis delivery systems or Cannabinoid delivery systems
Medical Cannabis
Medical Marijuana