Cannabis improved Crohn disease symptoms in small trials but did not reduce inflammation markers | Research

The takeaway

Three small placebo-controlled trials (93 total subjects) showed cannabis improved Crohn disease clinical symptoms, but two of three found no improvement in objective inflammation markers.

Gastroenterologists, IBD patients considering cannabis, and medical cannabis researchers.

93 subjects in 3 RCTs: symptoms improved but inflammation markers mostly unchanged

What the researchers found

Among the three existing placebo-controlled trials in active Crohn disease (93 subjects total), two showed significant clinical improvement (reduced CDAI scores) but no improvement in inflammatory markers. About 15% of IBD patients use cannabis to manage symptoms. The complexity of cannabis chemovars and the diversity of cannabinoid compounds create inherent research challenges.

Why it matters

Cannabis use is common among IBD patients, but the disconnect between symptom improvement and unchanged inflammation markers raises important questions about whether cannabis masks symptoms rather than treating the underlying disease.

The numbers in context

93 subjects across 3 placebo-controlled trials; ~15% of IBD patients use cannabis; 2 of 3 studies showed clinical improvement; 2 of 3 showed no change in inflammatory markers.

How the study worked

Expert review of clinical evidence on cannabis for Crohn disease, focusing on three placebo-controlled trials and the broader landscape of cannabinoid research in IBD.

What this study cannot tell us

Only 3 small RCTs available; 93 total subjects is very limited; cannabis products and doses varied; short trial durations; inflammatory markers may not capture all types of immune activity.

How to read the evidence

Moderate: expert review synthesizing the only available RCT data, which is very limited.

When this study was published

Published 2020.

The bigger picture

If cannabis improves how patients feel but does not address the underlying inflammation driving Crohn disease, patients might feel better while their disease silently progresses. This makes understanding the mechanism of benefit critical.

Questions still open

Could different cannabis chemovars produce anti-inflammatory effects? Would longer treatment duration eventually show inflammatory marker improvement?

Common questions

Does cannabis treat Crohn disease?

Small trials suggest it improves symptoms (how patients feel), but two of three studies found no change in inflammation markers. This means cannabis may help symptoms without addressing the underlying disease.

How many IBD patients use cannabis?

Approximately 15% of IBD patients use cannabis to manage their symptoms, despite limited clinical evidence for its effectiveness.

Read the original research

An overview of cannabis based treatment in Crohn's disease.

Expert review of gastroenterology & hepatology, 14(4), 253-257

View on PubMed ↗Publisher’s paper ↗

Citation

Naftali, Timna. (2020). An overview of cannabis based treatment in Crohn's disease.. Expert review of gastroenterology & hepatology, 14(4), 253-257. https://doi.org/10.1080/17474124.2020.1740590