Which red flag in adult back pain requires urgent evaluation?

• A. Nightly pain with rest
• B. Localized backache without neurological signs
• C. Progressive neurological deficit
• D. Pain worsened with activity

Answer: (C)

Progressive neurological deficit is the red flag that requires urgent evaluation because it means the spinal nerves or cord are being compromised and can deteriorate rapidly. This points to serious conditions such as cauda equina syndrome, spinal cord compression from a tumor or abscess, or other acute nerve injury, where prompt imaging and treatment are crucial to prevent permanent paralysis or loss of continence. In contrast, a localized backache without neuro signs is more common and often benign, while pain that worsens with activity fits typical mechanical strain. Night pains at rest are concerning for infection or malignancy and should be investigated promptly, but the immediate priority when new or worsening neurologic signs appear is urgent assessment and likely urgent intervention.