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Medical Cannabis for Chronic Pain

medical cannabis and chronic pain

Chronic pain is one of the most common long-term health issues in the UK. It affects millions of people and can interfere with work, sleep, and day-to-day life. Many rely on standard treatments, but these options don’t always bring enough relief. Likewise, some treatments may cause side effects that make things harder.

Because of this, more UK patients are asking whether medical cannabis could be an option when other treatments fall short. This guide explains what chronic pain is, how it’s usually treated, how medical cannabis fits into current UK law, and what the research shows so far.

This page summarises current medical research and is not medical advice. Always speak with a qualified doctor before starting or changing any treatment.

What Is Chronic Pain?

Chronic pain is pain that lasts three months or longer, even after an injury has healed or when the cause is unclear. It can be steady or come and go, and the impact builds over time.

Common symptoms include:

  • Ongoing pain that doesn’t go away
  • Stiffness, burning, or throbbing sensations
  • Tiredness or reduced movement
  • Sleep problems and mood changes, such as irritability or anxiety

Because chronic pain affects both body and mind, many patients feel frustrated when standard treatments only help a little or cause unwanted side effects. This often leads them to explore additional or alternative options under medical supervision.

Diagnosing Chronic Pain

Doctors start by reviewing your medical history, current symptoms, and any treatments you’ve already tried. They may also use tests such as:

  • X-rays or MRI scans
  • Blood tests
  • Nerve function tests

Not all chronic pain has a clear cause. It may be linked to arthritis, nerve damage, fibromyalgia, inflammatory conditions, surgery, or injury. Because every case is different, treatment plans need to be tailored to the individual.

Current Treatment Options

Most people start with standard therapies aimed at reducing inflammation, relaxing muscles, or interrupting pain signals. These may include:

  • NSAIDs (ibuprofen, naproxen)
  • Opioids, used cautiously because long-term benefits are limited and risks are higher
  • Antidepressants or anti-seizure medicines for nerve-related pain
  • Physiotherapy and exercise programmes
  • Cognitive behavioural therapy (CBT) or other psychological support

Many people find these treatments help to some extent, but not enough. Others struggle with side effects, such as stomach problems, sedation, or reduced focus.

When this happens, patients might look for other options, possibly including medical cannabis, to support quality of life under the guidance of a specialist. 

Medical Cannabis in the UK

Medical cannabis became legal in the UK in November 2018 as a Schedule 2 controlled drug. It can only be prescribed by a specialist doctor on the GMC Specialist Register.

While NHS prescriptions exist, they are extremely rare for chronic pain. As a result, most UK patients access treatment through private medical cannabis clinics. Specialists can assess whether cannabis might help after other treatments haven’t worked well.

A doctor may consider medical cannabis when:

  • You have long-term, difficult-to-treat pain.
  • Standard medicines provide limited relief.
  • Side effects make ongoing treatment difficult.
  • You’ve tried other options first.

Approved products in the UK include dried cannabis flower, oils and extracts, and certain cannabis-based medicines. All must be sourced through licensed pharmacies and meet strict quality standards.

Medical cannabis is not considered a first-line treatment. It is an option used in selected cases when other therapies haven’t achieved enough benefit.

What Does the Research Say About Cannabis and Pain?

Most of the clinical research on medical cannabis and chronic pain focuses on neuropathic pain and fibromyalgia-related pain. These conditions are easier to measure in controlled trials and tend to show the clearest signals in early findings.1,2

Evidence for other pain types, such as inflammatory or musculoskeletal pain, is growing, but the results remain limited.

Whole-plant cannabis and chronic pain

Large reviews of randomised trials show that medical cannabis and cannabinoids may provide small to modest improvements in pain, sleep, and overall function for some patients.

Benefits vary widely, and side effects such as dizziness and tiredness are more common than with placebo. These variations are influenced by the type of pain, the dose, and the formulation used.

Fibromyalgia and nerve-related pain

Fibromyalgia studies show mixed results. Some small trials report improvements in pain, sleep, or quality of life. Systematic reviews note that the overall quality of evidence remains low to moderate.3

Research on nabilone, a synthetic cannabinoid, suggests it may help some patients with fibromyalgia-related pain or poor sleep. The trials were small and short-term, so we look forward to further research.4,5

Nabiximols (THC:CBD oromucosal spray)

For neuropathic pain, a meta-analysis of nabiximols found a small but statistically significant benefit compared with placebo, along with mostly mild and temporary side effects.6 This makes it one of the more studied cannabis-based medicines. Even still, it is not considered a first-line therapy.

Emerging evidence in migraine

Early controlled research has shown that a THC+CBD combination delivered by inhalation may reduce acute migraine pain more effectively than placebo in the short term. However, everyone’s experience varies, and some effects may last up to 24 to 48 hours. These findings are still developing and are not yet part of standard clinical guidance.¹

Terpenes and the “entourage” effect

Laboratory and early translational studies suggest certain cannabis terpenes may influence inflammation and pain pathways.7,8 These terpenes include:

  • β-caryophyllene.
  • Myrcene.
  • Linalool.

However, researchers emphasise that well-designed human trials are still needed before these compounds can be considered clinically meaningful on their own.

Bottom line

Across the research, cannabis appears to offer modest improvements for some people with chronic or nerve-related pain, but it is not universally effective, and outcomes can vary.

Side effects are usually mild but more common than with placebo.

A specialist can help determine whether cannabinoid-based treatment might be suitable after other options have been tried.

Doctor Consultation: What to Expect

If you’re considering medical cannabis for chronic pain, your first step is a consultation with a specialist doctor at a private clinic.

During your appointment, the specialist will:

  • Review your medical history and previous treatments.
  • Discuss your symptoms, sleep, and daily activities.
  • Check for possible interactions with your current medicines.
  • Consider whether medical cannabis is appropriate or if other options may be better.

There is no obligation to start treatment after the consultation. A prescription is only offered if the specialist believes cannabis may help and you have tried other suitable treatments first.

If both you and the doctor decide to move forward, the clinic will provide a treatment plan and arrange regular follow-ups to monitor progress and safety.

FAQs About Medical Cannabis and Chronic Pain

Is medical cannabis legal in the UK?

Yes. It is legal with a prescription from a GMC-registered specialist doctor. Most prescriptions are issued through private clinics because NHS access is extremely limited for chronic pain.

What types of pain qualify?

Specialists may consider medical cannabis for:

  • Neuropathic pain
  • Fibromyalgia
  • Certain inflammatory or mixed pain conditions

Eligibility depends on your individual medical history and whether other treatments have already been tried.

Does the NHS cover medical cannabis?

Not usually. Most chronic pain patients receive treatment through private clinics, where prescriptions and medicines are paid out of pocket.

What side effects should I know about?

Some patients experience:

  • Drowsiness
  • Dizziness
  • Dry mouth
  • Mild changes in attention or mood

These effects are usually short-lived. Your doctor will monitor your experience and adjust the treatment if needed.

Can I drive while using medical cannabis?

You must not drive if you feel impaired. THC can affect reaction time in some people. Patients should discuss this with their doctor and follow UK drug-driving laws.

Closing: Your Choice, Your Comfort, Your Pace

Exploring medical cannabis is a personal choice, and it should be made with guidance from a qualified specialist who understands your full medical history.

Your privacy is protected, your care is confidential, and the goal is simple: to help you find safe, well-supervised options that support a better quality of life.

Resources

  1. Wang L, Hong P J, May C, Rehman Y, Oparin Y, Hong C J et al. Medical cannabis or cannabinoids for chronic non-cancer and cancer related pain: a systematic review and meta-analysis of randomised clinical trials BMJ 2021; 374 :n1034 doi:10.1136/bmj.n1034 ↩︎
  2. Walitt B, Klose P, Fitzcharles M-A, Phillips T, Häuser W. Cannabinoids for fibromyalgia. Cochrane Database of Systematic Reviews 2016, Issue 7. Art. No.: CD011694. DOI: 10.1002/14651858.CD011694.pub2. ↩︎
  3. Strand, N. H., Maloney, J., Kraus, M., Wie, C., Turkiewicz, M., Gomez, D. A., Adeleye, O., & Harbell, M. W. (2023). Cannabis for the Treatment of Fibromyalgia: A Systematic Review. Biomedicines, 11(6), 1621. https://doi.org/10.3390/biomedicines11061621 ↩︎
  4. Skrabek RQ, Galimova L, Ethans K, Perry D. Nabilone for the treatment of pain in fibromyalgia. J Pain. 2008 Feb;9(2):164-73. doi: 10.1016/j.jpain.2007.09.002. Epub 2007 Nov 5. PMID: 17974490. ↩︎
  5. are, Mark A. MBBS, MSc, MRCP*†; Fitzcharles, Mary-Ann MBBS, FRCPC‡; Joseph, Lawrence PhD§; Shir, Yoram MD*†. The Effects of Nabilone on Sleep in Fibromyalgia: Results of a Randomized Controlled Trial. Anesthesia & Analgesia 110(2):p 604-610, February 2010. | DOI: 10.1213/ANE.0b013e3181c76f70 ↩︎
  6. Igor Dykukha, Rolf Malessa, Ute Essner, Michael A Überall, Nabiximols in Chronic Neuropathic Pain: A Meta-Analysis of Randomized Placebo-Controlled Trials, Pain Medicine, Volume 22, Issue 4, April 2021, Pages 861–874, https://doi.org/10.1093/pm/pnab050 ↩︎
  7. Hebaallah Mamdouh Hashiesh, Charu Sharma, Sameer N. Goyal, Bassem Sadek, Niraj Kumar Jha, Juma Al Kaabi, Shreesh Ojha, A focused review on CB2 receptor-selective pharmacological properties and therapeutic potential of β-caryophyllene, a dietary cannabinoid, Biomedicine & Pharmacotherapy, Volume 140, 2021, 111639, ISSN 0753-3322, https://doi.org/10.1016/j.biopha.2021.111639. ↩︎
  8. Liktor-Busa E, Keresztes A, LaVigne J, Streicher JM, Largent-Milnes TM. Analgesic Potential of Terpenes Derived from Cannabis sativa. Pharmacol Rev. 2021 Oct;73(4):98-126. doi: 10.1124/pharmrev.120.000046. PMID: 34663685; PMCID: PMC11060501. ↩︎