Is Back Pain a Sign of Cancer?

Rarely. Back pain is extremely common, and muscle strain, disc problems, and posture explain the vast majority of it. Cancer is an uncommon cause. Back pain is more worth checking when it is new, unexplained, and does not follow the usual pattern of a muscle or disc problem.

Ordinary back pain often follows an activity, like lifting or a long car ride, and it improves with rest or movement. Back pain that is more worth checking does not follow an injury, does not ease with rest, or actually gets worse at night or while lying down. Pain that stays in one spot rather than moving around, and pain that comes with unexplained weight loss, fatigue, or other new symptoms, adds to the concern.

Cancer can cause back pain in a few ways. A tumor in the spine, or one that has spread to the spine from elsewhere in the body, can press on bone or nerves. Cancers of the pancreas and kidney can cause back pain by pressing on nearby structures as they grow. Multiple myeloma, a cancer of plasma cells in the bone marrow, commonly causes bone pain, often in the back, because it weakens bone in multiple places at once.

Muscle strain from lifting, exercise, or poor posture causes most short-term back pain. Disc problems, arthritis, and general wear and tear on the spine cause much of the ongoing back pain adults experience, especially with age. Poor sleeping positions and prolonged sitting can also contribute. Most back pain, even pain that lasts weeks, traces back to one of these causes rather than cancer.

Your doctor asks when the pain started, whether it followed an injury, and whether it changes with rest, movement, or time of day. A physical exam checks your range of motion, strength, and reflexes. For pain that follows a typical strain pattern, many doctors reasonably start with conservative treatment, like rest and physical therapy, before ordering imaging. If pain is severe, does not improve, or comes with weight loss or other symptoms, an x-ray or MRI is the next step. If imaging shows something concerning, a biopsy confirms what it is. That means taking a small tissue sample to check under a microscope. NCI says the report usually reaches your doctor within 10 days.

Imaging that looks normal rules out most serious causes and is genuinely reassuring. If pain continues despite normal imaging, or new symptoms develop, that is a reason to follow up rather than assume nothing more needs to be done.

• Call 911 or go to an emergency department if back pain comes with new leg weakness, numbness in your legs or around the groin, or a loss of bladder or bowel control.
• Call your care team the same day if pain wakes you every night and is clearly getting worse, or arrives together with a fever.
• Call your care team within a day or two if the pain is new and unexplained, has lasted more than a couple of weeks, or does not follow the usual strain-then-recover pattern.

• Should this pain be evaluated with imaging?
• Could it be caused by something other than cancer?
• What tests would help find the cause?
• What symptoms should prompt me to come back sooner?

• American Cancer Society — Signs and Symptoms of Cancer
• National Cancer Institute — Multiple Myeloma Treatment (PDQ)
• National Cancer Institute — Pathology Reports