Diagnostic Approach to Back Pain

Back pain is one of the most common chief complaints you'll see in primary care—and one where it's easy to wonder whether you're missing something serious or ordering testing that isn't actually necessary.

The key is having a systematic way to work through it: screen for red flags first, consider whether the pain could be coming from something other than the musculoskeletal system, perform a focused exam, and then decide whether the patient needs imaging, further evaluation, or conservative management.

In this episode, I walk through my approach to evaluating low back pain in primary care, including the history questions I ask, the red flags I don't want to miss, my focused physical exam, when I consider imaging, and how I set expectations for recovery.

2026 Update: The overall triage-based approach to low back pain in this episode is still one I use and teach today. A few points about imaging and escalation are worth clarifying:

  • Trauma doesn't automatically require imaging. Consider the mechanism of injury, fracture risk factors, exam findings, and clinical suspicion when deciding whether imaging is indicated.

  • Routine imaging isn't recommended for uncomplicated low back pain without red flags or another specific indication. When imaging is needed, the type of imaging should be based on the suspected pathology.

  • Suspected cauda equina syndrome requires urgent/emergent evaluation and MRI. Concerning findings include urinary retention or new urinary/fecal incontinence, saddle anesthesia, and severe or progressive lower-extremity neurologic deficits.

For a current point-of-care approach to evaluating back pain, including red flags, focused exam, imaging considerations, and next steps, see the Back Pain Cheat Sheet in the Digital NP Binder.

 

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What I Cover in This Episode:

  • A triage-based approach to evaluating low back pain

  • History questions that help narrow the differential

  • Red flags for cauda equina syndrome and other serious causes of back pain

  • Considering non-musculoskeletal causes of back pain

  • What to include in a focused physical exam

  • Straight leg raise, FABER testing, and lower-extremity strength testing

  • When imaging may—or may not—be appropriate

  • Physical therapy and setting realistic expectations for recovery

Key Takeaways

Start by Looking for What You Can't Miss

Before assuming low back pain is musculoskeletal, screen for serious neurologic compromise, fracture, infection, malignancy, and non-musculoskeletal causes suggested by the history and presentation.

Ask Specifically About Cauda Equina Symptoms

Don't just ask whether the patient has “bowel or bladder problems.” Ask specifically about new urinary retention or incontinence, bowel dysfunction, saddle anesthesia, and new or progressive lower-extremity weakness or neurologic deficits. Suspected cauda equina syndrome requires urgent/emergent evaluation and MRI.

Remember: Back Pain Isn't Always Coming From the Back

Consider whether the presentation could reflect another process, such as pyelonephritis, abdominal or pelvic pathology, or vascular disease, based on the location, associated symptoms, and risk factors. The episode specifically makes this distinction rather than treating all back pain as mechanical.

Use the Exam to Narrow Your Differential

Your exam should be driven by what you're considering. Depending on the presentation, that may include spinal and muscular palpation, neurologic testing including strength and sensation, straight leg raise, hip assessment/FABER, abdominal exam, or other targeted examination.

Most Uncomplicated Low Back Pain Doesn't Need Immediate Imaging

Don't order an X-ray or MRI simply because a patient has back pain. Imaging should be driven by red flags, concern for specific underlying pathology, or other clinical indications.

Set Expectations for Recovery

For uncomplicated musculoskeletal low back pain, help patients understand that improvement may take time. Discuss activity, appropriate conservative management, physical therapy when indicated, follow-up, and the symptoms that should prompt earlier reassessment.

Want Low Back Pain Quick References?

The Back Pain Cheat Sheet gives you a quick, step-by-step approach to evaluating back pain—including red flags, the focused exam, imaging considerations, and next steps. Get your copy inside the Digital NP Binder.

And if you want help making sure you ask and document the important history questions during the visit, the Quick Text Library includes a customizable Low Back Pain HPI QuickText you can add to your EHR. Check out the Quick Text Library here.

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© 2026 Real World NP. For educational and informational purposes only, see realworldnp.com/disclaimer for full details.

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