Cannabis for Back Pain: Short Answer
No cannabis product is FDA approved to treat back pain. Evidence for cannabinoids in chronic pain is mixed. Most trials enrolled people with nerve pain, not back pain. THC reduces pain for some patients. CBD has weaker evidence. Adults 21 and older can buy cannabis in states with legal medical or adult-use programs.
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What Back Pain Is
About 80% of US adults have low back pain at some point. Most cases have no clear cause and improve in 4 to 6 weeks. Pain that lasts 12 weeks or longer is chronic. Common causes include muscle strain, disc degeneration, spinal stenosis, and nerve compression.
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How Cannabinoids Work
THC binds CB1 receptors in the brain and spinal cord. That changes how the body sends and reads pain signals. CBD binds CB1 and CB2 with low affinity and slows the breakdown of anandamide, a natural endocannabinoid. CBD does not cause intoxication. THC does.
What the Studies Show
A 2017 report from the National Academies of Sciences, Engineering, and Medicine found substantial evidence that cannabis reduces chronic pain in adults. Most of those trials used neuropathic pain patients. A 2018 Cochrane review of 16 trials found low-quality evidence for cannabis in chronic neuropathic pain. Sample sizes were small. Few trials tracked back pain alone. Research on CBD for back pain is thinner than research on THC.
Products and Onset Times
- Inhaled flower or vape: onset 1 to 10 minutes, peak 15 to 30 minutes, effects last 2 to 4 hours.
- Tincture under the tongue: onset 15 to 45 minutes.
- Edible or capsule: onset 30 to 120 minutes, effects last 4 to 8 hours.
- Topical balm or patch: acts at the application site, little THC reaches the bloodstream.
Dosing
No standard dose exists. A common starting point is 1 to 2.5 mg THC. Wait 2 hours before a second edible dose. Ratios of 1:1 THC to CBD are common for pain. Keep a log with product name, THC mg, CBD mg, time, and pain score. Label accuracy varies by product, so check batch test results.
Side Effects and Risks
- Dizziness, dry mouth, drowsiness, fast heart rate.
- Impaired memory and coordination for several hours. Do not drive.
- Dependence: about 9% of adults who use cannabis, and 17% when use starts in the teen years.
- Cannabinoid hyperemesis syndrome: repeated vomiting and belly pain. Hot showers bring short relief.
- Smoked cannabis irritates airways and links to bronchitis.
- High THC doses can trigger anxiety or panic.
Drug Interactions
CBD inhibits the CYP3A4 and CYP2C19 enzymes. That can raise blood levels of warfarin, clobazam, and other prescriptions. Cannabis plus opioids or alcohol raises sedation and breathing risk. Tell a pharmacist about every product you use.
Legal Status in the US
Cannabis is illegal under federal law and listed as a Schedule I substance. More than 30 states allow medical cannabis. About two dozen allow adult use. State rules cover possession limits, purchase age, and home grow. Federal law still applies at borders, airports, and on federal land.
What to Tell Your Doctor
Bring product labels, THC and CBD amounts per dose, and your log. Ask about interactions with current prescriptions. Ask about alternatives with stronger evidence, including physical therapy, NSAIDs, and exercise. Some clinicians support cannabis as a substitute for opioids, but the data on that swap is mixed.