Spinal cord compression in cancer: a case-based approach

The presentation

Imagine an adult known to have cancer who develops new, worsening back pain over a couple of weeks. The pain is severe, worse at night and when lying flat, and now shoots like a band around the chest or down the legs. Over the last day their legs have felt heavy and weak, they are unsteady on their feet, and they have noticed numbness in the legs and difficulty passing or controlling urine. This combination — new or changing back pain in someone with cancer, followed by leg weakness, numbness or bladder or bowel problems — is the classic warning of spinal cord compression. The pain often comes first and can precede the nerve damage by days or weeks, which is exactly the window in which acting early can preserve function.

Why it is an emergency

The spinal cord is a delicate cable of nerves running down the spine. When cancer in a spinal bone grows or a bone collapses, it can squeeze the cord or the nerve roots below it. Nerve tissue does not tolerate pressure for long: the longer the cord is compressed, the more likely the damage becomes permanent. Once someone loses the ability to walk, the chance of getting it back falls sharply the longer treatment is delayed. This is why spinal cord compression is treated as an emergency needing assessment and, in most cases, an urgent MRI scan of the whole spine within 24 hours of suspicion. Early diagnosis and treatment protect walking, bladder and bowel control and independence — outcomes that are very hard to recover once lost.

The warning signs to act on

In anyone with known cancer, certain symptoms should ring alarm bells. New, worsening or severe back or neck pain — especially pain that is worse at night, worse lying down, or that wraps around the body like a band — deserves urgent attention even before weakness appears. So do heaviness, weakness or clumsiness in the legs, unsteadiness or difficulty walking, numbness or tingling in the legs or around the back passage, and any new difficulty passing urine, a full bladder that will not empty, or loss of control of the bladder or bowel. These last symptoms are especially serious. People with cancers that commonly spread to bone — such as breast, prostate, lung, kidney and myeloma — and their families should know these signs and act on them straight away rather than waiting.

How it is investigated and treated

When spinal cord compression is suspected, the priority is an urgent MRI scan of the whole spine, ideally within 24 hours, because it shows exactly where and how badly the cord is squeezed. While waiting, doctors often start steroids to reduce swelling around the cord and give strong pain relief, and advise care with movement to protect the spine. Treatment then depends on the individual and may include radiotherapy to shrink the cancer, or surgery to relieve the pressure and stabilise the spine, alongside treatment of the underlying cancer. Physiotherapy and rehabilitation help recovery. Throughout, the aim is to relieve pressure quickly to preserve as much movement, sensation and bladder and bowel control as possible, and to keep the person comfortable and supported.

The safe pathway

The practical rule for anyone living with cancer is to take new back pain and leg symptoms seriously. Persistent or worsening back or neck pain in someone with cancer should be reported to their cancer team or GP urgently, without waiting for a routine appointment. But if there is leg weakness, difficulty walking, numbness in the legs or around the back passage, or any problem passing or controlling urine or bowels, this is a medical emergency — seek help immediately by contacting the cancer team's acute line, calling NHS 111, or attending A&E, and call 999 if the person cannot move their legs or has suddenly lost bladder or bowel control. Many cancer centres have a dedicated spinal cord compression hotline. Acting within hours protects the ability to walk.