Rethinking nonspecific low back pain: Evolving from an undifferentiated working diagnosis to precision spine care

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Rethinking nonspecific low back pain: Evolving from an undifferentiated working diagnosis to precision spine care Low back pain (LBP) is one of the most common reasons patients seek medical care and one of the leading causes of disability worldwide.Despite its prevalence, the diagnostic approach to LBP remains remarkably imprecise, particularly in general medical settings.A significant proportion of patients are ultimately assigned the diagnosis of "nonspecific low back pain" (NSLBP), a term that has become ubiquitous in general clinical practice, clinical practice guidelines, and unfortunately, research.Although NSLBP may serve a pragmatic role as an initial working classification, its widespread use as a diagnosis creates important conceptual and scientific limitations.The central issue is not whether NSLBP has clinical utility, but rather, what the term actually represents, what information is lost when it is applied, and how it should be used when making clinical decisions and advancing research intended to aid a more optimal spine care paradigm in the future. What is NSLBP?NSLBP is generally defined as LBP for which no specific underlying condition is identified after clinical evaluation.Contemporary descriptions typically define it by exclusion: the patient has LBP without features suggesting a specific spinal disorder, such as fracture, infection, malignancy, inflammatory disease, radiculopathy, or significant spinal stenosis, and without evidence of a relevant nonspinal source.A 2026 JAMA review, for example, defines NSLBP according to the absence of clinical features suggestive of a specific underlying condition or referred pain from a non-spinal source [1].Thus, NSLBP is perhaps better understood as an undifferentiated or undiagnosed category of LBP than as a discrete disease entity.This distinction is important.A diagnosis generally communicates something about the condition affecting a patient-its etiology, pathophysiology, prognosis, or expected response to treatment.In contrast, NSLBP primarily communicates that a more specific diagnosis has not been established.This distinction becomes particularly important because there is no single universally accepted model for diagnosing or classifying LBP.Various diagnostic frameworks emphasize different dimensions of the same clinical presentation.One approach prioritizes pathoanatomy; another distinguishes nociceptive, neuropathic, and nociplastic mechanisms; another classifies patients according to clinical examination findings or movement patterns; and still others incorporate psychosocial, behavioral, functional, or multidimensional factors [2].Consequently, the same patient may be labeled with "NSLBP" within one diagnostic framework while simultaneously meeting criteria for a more specific phenotype within another.NSLBP is therefore not necessarily synonymous with an absence of clinically meaningful diagnostic information.Rather, it may reflect the purpose, limitations, or level of resolution of the diagnostic framework being applied.

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