Chart Review of 139 Medical Cannabis Patients Revealed Complex Pain and Major Access Barriers | Research

The takeaway

Among 139 chronic pain patients legally using medical cannabis in Washington State, 88% had multiple pain conditions, and 37% faced significant barriers to accessing their authorized treatment.

Read this if you're considering medical cannabis for pain and want to understand what other patients' experiences look like.

88% had multiple pain conditions; 37% faced major access barriers despite legal status

What the researchers found

Researchers reviewed charts of 139 patients legally authorized for medical cannabis in Washington State, seen at a university pain clinic.

The patient population was complex: 88% had more than one pain syndrome. The most common diagnoses were myofascial pain (82%), neuropathic pain (64%), discogenic back pain (52%), and osteoarthritis (27%). Other conditions included diabetic neuropathy, fibromyalgia, HIV neuropathy, phantom limb pain, and cancer pain.

Males (63%) and females (37%) accessed medical cannabis at approximately equal rates with similar authorization durations (median 1.12 years, range 11 days to 8.3 years).

A striking 37% of patients faced documented access barriers: prior physicians unwilling to authorize use, legal problems related to medical cannabis, and difficulties finding affordable, consistent supply. Despite these barriers, the majority of records documented significant symptom alleviation.

Why it matters

This was one of the earliest detailed profiles of medical cannabis patients in the US. It revealed that these were complex pain patients, not recreational users seeking access, and that significant barriers existed even in a state with legal medical cannabis.

The numbers in context

139 patients (87 male, 52 female). Median authorized use: 1.12 years. 88% had 2+ pain conditions. Myofascial pain: 82%. Neuropathic pain: 64%. Discogenic back pain: 52%. 37% faced major access barriers.

How the study worked

Retrospective chart review of 139 patients at a university-based pain clinic in Washington State. All were legally authorized for medical cannabis. Records were scored for demographics, diagnoses, McGill Pain scores, functional status, analgesic use, and access barriers.

What this study cannot tell us

Retrospective chart review with inherent limitations in data quality. Single clinic in one state may not represent all medical cannabis patients. Self-selection bias (only patients reaching a university pain clinic). No control group for symptom outcomes.

How to read the evidence

This is a retrospective chart review providing descriptive data about a medical cannabis patient population, with moderate evidence value for characterization but limited for efficacy claims.

When this study was published

Published in 2009. Medical cannabis access has expanded significantly since, though many access barriers persist in various forms.

The bigger picture

This study challenged stereotypes about medical cannabis patients by showing they were a clinically complex population with legitimate pain conditions and significant unmet needs. The access barriers documented in 2009 anticipated issues that continue in medical cannabis programs today.

Questions still open

Has the access barrier situation improved with expanded legalization? Do medical cannabis patients reduce use of other analgesics over time?

Common questions

What types of pain do medical cannabis patients have?

In this study, myofascial pain (82%) was the most common, followed by neuropathic pain (64%) and back pain (52%). Most patients had multiple overlapping pain conditions, reflecting the complexity of chronic pain.

What kinds of access barriers existed?

Common barriers included physicians refusing to authorize cannabis (even in a legal state), legal complications, and difficulty finding affordable, consistent supply. Over a third of patients faced at least one major barrier.

Read the original research

Characteristics of patients with chronic pain accessing treatment with medical cannabis in Washington State.

Journal of opioid management, 5(5), 257-86

View on PubMed ↗

Citation

Aggarwal, Sunil K; Carter, Gregory T; Sullivan, Mark D; ZumBrunnen, Craig; Morrill, Richard; Mayer, Jonathan D. (2009). Characteristics of patients with chronic pain accessing treatment with medical cannabis in Washington State.. Journal of opioid management, 5(5), 257-86.