How can persistent, multisystem, time-varying symptoms beyond diagnostic boundaries be observed and studied safely?
Define a shared observational grammar for temporality, symptom connections, functional loss, and treatment response that diagnoses and symptom counts may omit—without conflating residual symptoms of established disease, evolving differential diagnoses, recognised functional syndromes, post-infectious or treatment-related states, and context-dependent symptom patterns.
Why it remains open
Terms such as medically unexplained symptoms, persistent physical symptoms, and functional somatic disorders differ in scope and theoretical commitments. None supplies one cause for a heterogeneous population, and incomplete explanation does not imply psychogenesis. At the same time, speaking of symptoms beyond diagnostic boundaries must never close reassessment for rare, progressive, or treatable disease.
Constraints
- Do not use “diagnostic remainder” as a patient identity or new diagnosis.
- Maintain red-flag evaluation, referral, and reassessment alongside symptom and function research.
- Korean-medicine patterns, examination findings, and treatment responses remain observations—not diagnoses or mechanistic proof—until validated.
- Do not erase patient language or functional goals to fit a classification system.
Candidate routes
- Non-equivalent comparison of contemporary diagnostic/syndromic terms with Korean, Chinese, and Japanese clinical phenomenon vocabularies
- Develop a minimum longitudinal observation set for sequence, coupling, triggers, relievers, function, and treatment exposures
- Prospective registry with internal and external validation under separate ethics approval
- Parallel study of competing mechanisms, therapeutic possibilities, and disconfirmation conditions by phenotype
Disconfirmation and failure
- The new observational grammar adds no information about patient-important outcomes or decisions beyond diagnoses and standard symptom measures.
- Phenotypes do not reproduce across observers, sites, or time.
- Korean-medicine observations fail to improve calibration or clinical utility, or increase harm.
- The proposed stratification distorts lived experience or increases stigma.
Why this question matters in practice
If supported, this could describe symptom trajectories and functional losses that remain after fragmented care and identify which therapeutic hypotheses can be tested safely in which subgroups. Negative findings would still show where Korean-medicine observations add no value and where renewed biomedical evaluation must take priority.