working-paperBRC-2026-W201
A report of cold hands or feet can refer to felt cold, site-matched skin-surface temperature, an explicitly named local flow or perfusion measure, and the rewarming course, but these four observations are not substitutes for one another. In a provoked immersion series of 12 people selected for cold-sensitive hands, median superficial dorsal-hand perfusion changed little from 52.5 to 51.3 perfusion units, while participant-level values rose in six and fell in six. Other controlled studies found different cold ratings at comparable measured temperatures. In a separate foot-immersion test, the injury group differed from two control groups in sensation and coldest-toe temperature at minutes five and ten, while great-toe temperature did not differ, the mean-toe result did not cross the conventional statistical significance threshold, and great-toe cutaneous vascular conductance was also similar. Temperature and recovery values also had to be interpreted with their device, exact site, sampling schedule, time origin, and endpoint. None of these findings identifies a cause or subtype, and a specific exposure, skin or tissue finding, or relevant disease context changes the question being asked. From 2026-08-16T16:06:11Z to 2026-08-16T20:19:50Z, 238 records were screened across 13 prespecified PubMed searches; passages cited in the synthesis were checked through 2026-08-17T03:40:34Z. Within that route and date range, we found no qualifying hand dataset that synchronized participant-level felt cold, site-matched skin-surface temperature, an explicitly named local flow or perfusion measure, and the complete rewarming course during naturally occurring recurrent episodes; the same bounded result arose separately for feet. This does not establish absence from unreviewed results, other databases, inaccessible material, or later publications. The next step is a prospective repeated-observation study that keeps hands and feet separate and preserves individual trajectories, but it remains unvalidated until feasibility and synchronization, technical repeatability and device-site agreement, Korean and English sensory-wording evaluation, prespecified construct-validity testing, and external replication succeed.
protocolBRC-2026-W202
Research on recurrent cold hands or feet can become uninterpretable before analysis begins. A single episode may generate a momentary cold-sensation rating, a skin-surface temperature at one named site, a flow or perfusion result from one named tissue compartment, and several possible summaries of rewarming. These observations sometimes align and sometimes diverge, while baseline, onset, exposure, first measurement, recovery, and clinical-course clocks are not interchangeable. The unresolved reader problem is therefore not how to choose one measure as the truth, but how to observe their relation without collapsing constructs, sites, compartments, or clocks.
working-paperBRC-2026-E103
One side of the body can feel burned or frozen while a thermometer or thermogram shows little unusual. We often try to choose between sensation and number. But an infrared camera samples one moment at the skin surface, whereas the nervous system reads temperature together with rate of change, location, contrast, pain, and threat. Healthy people vary widely in detecting the same thermal change; innocuous cooling can feel warm, and mild temperatures can evoke burning. After nerve injury, small cooling can become severe pain. Sensation is not a thermometer, but that does not make it false. Trouble begins when one normal test becomes a verdict on the whole experience. Direct research is missing, yet studies of chronic pain and illness show how disbelief and self-doubt, concealment, and relational withdrawal can deepen isolation. Rather than choosing a winner between two data streams, this essay proposes placing location, time, temperature, sensory thresholds, and social response on the same event timeline.
working-paperBRC-2026-E102
What would appear if a Back-Shu map were overlaid on the body of someone who feels heat in the back? The concepts share a region, and classical medicine discusses viscera and heat together. Yet the Donguibogam sentence on back heat contains no acupoint, while the Lingshu chapter on Back-Shu points contains no heat sensation. The Suwen does connect heat with the vicinity of visceral Shu points, but in the treatment architecture of heat illness, not spontaneous back heat. Modern studies have measured temperature and tissue differences at some Back-Shu sites, but have not studied people recruited for back heat. This essay treats the mismatch not as failure but as a blueprint: map the felt location first, measure thermography during an episode, and only then overlay a blinded point grid and compare point centres with adjacent and mirrored skin. A historically plausible connection exists. Whether Back-Shu points cause, diagnose, or treat back heat remains a question before experiment, not a conclusion after it.
working-paperBRC-2026-E101
“My back feels hot” is a clear statement, but the object of study is not. Skin-surface temperature, spontaneous warmth, burning pain, itch-associated burning, and responses to imposed thermal stimuli may be different phenomena. We searched modern biomedical research, Korean scholarship, related expressions in East Asian medical texts, and clinical safety guidance. The search did not reveal one cause. It revealed that several observations had been folded into one symptom name while different fields measured only fragments of it. This reader edition reconnects the evidence of four source papers as one scientific essay.
working-paperBRC-2026-W106
The statement “I feel hot” and a Celsius value from infrared thermography do not measure the same object. A camera estimates surface temperature at a particular site and moment; a report integrates cutaneous and deeper inputs, rate of change, spatial contrast, nociception, autonomic state, and context. Even among healthy participants, accuracy in detecting thermal change varies widely, while innocuous cooling can be experienced as warmth and interlaced warm–cool stimulation can evoke burning pain. In neuropathic sensory states, mild cooling may become severe pain. Physiological events can also occur without awareness. A single unremarkable thermogram therefore means no surface-temperature anomaly was detected under those conditions; it does not prove that recurrent thermal experience is absent. Conversely, symptom report alone cannot diagnose a particular neuropathy or autonomic disorder. Quantitative sensory testing measures detection and pain thresholds but depends on cooperation and standardization; thermography is sensitive to environment, acclimatization, region selection, and timing. We found no study directly testing whether this discordance causes social isolation. Indirect evidence from chronic pain and persistent unexplained symptoms links disbelief, unexplained normalization, self-doubt, and withdrawal with isolation. Rather than upgrading this indirect evidence to causation, we propose: qualitative work beginning with patients’ language; 21-day event-contingent repeated measurement; simultaneous standardized thermography, quantitative sensory testing, and perception ratings; and prospective measurement of communication, invalidation, and isolation. Sensation is not a thermometer, and a thermometer is not a lie detector for sensation.
working-paperBRC-2026-W105
Heat on the back (beire) and Back-Shu points (beishu) both invoke the back, and classical medicine often relates heat to viscera, making a direct connection tempting. Separated by textual genealogy, however, the relationship is limited. The Donguibogam entry quotes the Yixue Rumen to place back heat in a lung and upper-burner explanatory network but mentions neither an acupoint nor needling. The Lingshu chapter locates visceral Back-Shu points by vertebral level and palpatory response but does not discuss back heat. The Suwen places ten points beside the five visceral Shu points within a needling system for heat illness, not a study of spontaneous localized heat on the back. A 2022 systematic review of ten acupoint-temperature studies could not establish disease specificity because of heterogeneity and methodological limitations. A 2024 thermographic study of 50 people with lumbar-disc-herniation low-back pain and 45 healthy controls reported asymmetry at several lumbar Back-Shu points, but did not recruit people for back heat. A study of 48 healthy adults found site-to-site differences in tissue properties and pressure sensitivity, showing that anatomy alone can create apparent point differences. Current evidence therefore supports a testable historical and measurement hypothesis—not the conclusion that Back-Shu points cause, diagnose, or treat heat on the back.
working-paperBRC-2026-W101
Recurrent localized back heat or burning sounds like one observation, yet spontaneous sensation, skin-surface temperature, evoked thermoception, and conditional safety assessment are distinct evidence objects. This critical synthesis crosses indirect evidence on pain language, sensory testing, thermography, dorsal sensory syndromes, and two selected UK guidelines. No reviewed source establishes a default cause or diagnosis. A useful next study must preserve participants’ wording, location, depth, boundary, and timing, then link each episode to concurrent measurements.
working-paperBRC-2026-W102
This evidence map asks what has actually been studied around recurrent localized back heat. Prespecified source roles covered modern biomedical literature, Korean and East Asian databases, classical terminology, and safety sources; twelve priority objects received passage-level verification. The available literature clusters around itch-defined dorsal sensory syndromes, evoked sensory testing, post-exercise skin temperature, pain descriptors, and selected safety guidelines. No participant-level study was found that linked a spontaneous target episode with concurrent skin temperature and sensory testing. Negative yields define a bounded search gap, not proof of absence.
protocolBRC-2026-W103
This protocol specifies a small prospective feasibility study of recurrent heat, warmth, burning, or adjacent thermal expressions localized to the back. Participants’ original wording and drawn boundaries are preserved before investigators apply a prespecified eligibility dictionary. Event, symptom-free comparator, and standardized-visit clocks are separated; sensation maps, skin-surface temperature, evoked thermoception, functional impact, and context remain non-interchangeable observation lanes. The study does not validate a diagnostic tool, and it treats safety exits and missingness as reportable outcomes.
working-paperBRC-2026-W104
“Heat” or “burning” may matter clinically, but the word alone cannot establish cause, risk, imaging need, or reassurance. This counter-hypothesis combines inconsistent descriptor evidence, selection and missingness in dorsal sensory cohorts, construct differences across thermography and sensory testing, and the conditional context of selected NICE guidelines. Those guidelines do not use thermal wording as a stand-alone decision rule; they depend on population, tempo, distribution, and associated findings. Research phenotyping must therefore remain separate from safety decisions, and this paper does not offer individual clinical instructions.
working-paperBRC-2026-W001
When one person reports heat in the back and a deep chill in the hands at the same time, placing the experience on a single “cold or heat” axis erases its most clinically informative features: distribution and simultaneity. Replacing that experience with one thermographic image erases sensory coding, temporal delay, adaptation, and context. This problem-led critical synthesis reads Korean-medicine cold–heat questionnaires; Korean and Japanese work on cold hypersensitivity; thermosensory physiology; quantitative sensory testing; vascular provocation; objective–subjective discordance in hot flushes; neuropathic burning; and the regional, depth, and temporal distinctions preserved in the Donguibogam. Three recurrent reductions emerge: spatial reduction of whole-body cold–heat into a sum score; temporal reduction of a fluctuating event to resting skin temperature; and criterion circularity when groups defined by expert judgment or self-report are reclassified using closely related questions or images. We propose a “local thermal field” that records, for location l and time t, perceived quality and intensity P(l,t), skin temperature and its rate of change T(l,t), cold and warm detection Q(l,t), perfusion and rewarming V(l,t), provoking and relieving context C(t), and functional effect F(t). This is not a new diagnosis but a measurement grammar for separating competing explanations. The first study should not train an AI to guess disease or test treatment effectiveness. It should combine cognitive interviews, 14-day event-based body maps, ambient temperature, and standardized rest–provocation–recovery observations to test repeatability, added information, and feasibility. The contribution of Korean-medicine observation is not to replace biomedical measurement, but to preserve experiences in which different regions move in different directions and to make any added prognostic, functional, or treatment-selection value falsifiable.
