Ulcerative Colitis, Cancer Risk, and the Role of Cannabis

By Kieron JH • Published August 2025

What Is Ulcerative Colitis?

Ulcerative colitis (UC) is a long-term inflammatory bowel disease (IBD) that causes inflammation and ulcers in the colon and rectum. It’s an autoimmune condition where the immune system mistakenly attacks healthy gut tissue, triggering chronic inflammation. Symptoms often include:

• Persistent diarrhoea (often bloody)
• Abdominal pain and cramping
• Fatigue
• Urgent bowel movements
• Weight loss

Increased Cancer Risk

People with ulcerative colitis are at increased risk of developing colorectal cancer, especially when:

• The disease has persisted for more than 8-10 years
• There’s widespread inflammation (pancolitis)
• There’s a family history of colorectal cancer
• Dysplasia (pre-cancerous changes) is detected during colonoscopy

Regular surveillance via colonoscopy is recommended to detect early changes. Cancer risk doesn’t mean inevitability, but it does demand vigilance.

How Cannabis May Help

Although not a cure, cannabis has shown promise in managing ulcerative colitis symptoms. Clinical studies and patient reports suggest that certain compounds in cannabis – particularly CBD and THC – can reduce inflammation, ease abdominal pain, and improve appetite and mood.

Benefits include:

• Anti-inflammatory effects (via CB2 receptor activation)
• Relief from cramping and diarrhoea
• Improved sleep and reduced anxiety
• Reduction in steroid reliance (in some patients)

Importantly, smoking cannabis – like smoking anything – can irritate the gut and lungs. Safer alternatives include:

• Vaping dry herb (low temperature)
• Edibles or oils for slower, longer relief
• Capsules or tinctures for precise dosing

Some patients report flare-up triggers related to diet, stress, or even prescription medications. In contrast, carefully dosed cannabis – with medical supervision – may help stabilise the system. It’s not for everyone, but for some, it’s a game-changer.

Medical Cannabis and the UK

In the UK, medical cannabis is legal but difficult to access through the NHS. Private clinics are currently the main route. A diagnosis of ulcerative colitis, especially with chronic pain or treatment resistance, may qualify a patient for a legal prescription.

Written by Kieron JH | The Reasonable Adjustment