Time To Expand The Term ‘Minor Head Injury’: Clinical Risk And Biomarker Research

Issues with the term “minor head injury"

This terminology lacks precision and significantly underestimates the clinical risk. Evidence shows that up to 15% of patients with GCS 13–15 head trauma demonstrate clinically relevant findings on computed tomography (CT) imaging.⁹ Delayed intracranial haemorrhage is seen, particularly in patients on anticoagulant or antiplatelet therapy.² While the rates of mortality and neurosurgical intervention are lower than those associated with severe TBI, they remain clinically significant.^1,2

This is important at all labels and can mask clinical heterogeneity, and is typically a euphemism. Furthermore, the term fails to differentiate between patients based on critical factors such as loss of consciousness, amnesia, emesis, advanced age, or high-risk mechanisms of injury. It also fails to account for findings on CT or advanced imaging.¹ It can cause medico-legal and communication issues because patients or relatives can misinterpret the term as meaning no further concern or follow-up required.³ Worsening in the future can be complicated by previous use of the term “minor” in litigation or ongoing care.

Case vignettes illustrating the issue

We can mention that clinical recommendations are inconsistent across guidelines—such as NICE (UK) and ACEP (US)—and clinical decision rules like the Canadian CT Head Rule, which are discordant on thresholds of imaging and admission because they are inconsistent in defining “minor”.¹⁰ Some employ GCS 15 alone, others 13–14.

• Case 1: 74-year-old on clopidogrel with GCS 15 following ground-level fall. CT shows a small subdural hematoma. Patient deteriorates within 12 hours and needs surgical evacuation. Originally referred to as “minor,” the prognosis is grave.

• Case 2: A 19-year-old GCS 15 on presentation with a sport-related head injury. No imaging was taken. Three weeks later, he returns with headache, sleep disturbance, and cognitive impairment—classic post-concussion syndrome symptoms. The “minor” designation had ended the case too hastily.

A call for terminological reform and a proposed terminology framework

We propose substituting “minor head injury” with structured descriptors that are more specific: GCS Score: e.g., “Head injury with GCS 15” instead of “minor."; Imaging Results: “CT-negative mild head injury” vs. “CT-positive mild TBI."; Mechanism and Risk: “Low-risk closed head trauma,” “anticoagulated head injury,” or “mild TBI with high-risk features.” We believe it is essential to integrate risk-stratification instruments alongside biomarkers to optimise triage decisions and identify patients requiring specialised follow-up care. Validated clinical decision rules, such as the Canadian CT Head Rule, New Orleans Criteria, or National Emergency X-radiography utilization study (NEXUS) Head CT Rule , should be routinely applied.^9,11 Combining these tools with the expanded use of biomarkers can introduce greater objectivity and a risk-stratified nomenclature [Table 1 and Figure 1].^{4-8, 12-17}

In summary, the phrase “minor head injury” is an outdated descriptor. Once employed as a shorthand to prevent overresponse to low-risk trauma, the phrase now carries the danger of underestimating risk. With the uncertainty of outcome—even among patients with GCS 15—it is time to embrace terminology that appreciates the nuance of head trauma and emphasises clarity, safety, and specificity. Practically, this transition improves triage for high-risk groups (such as the elderly), provides clearer definitions for research cohorts, and ensures patients fully understand the necessity of follow-up care.