Persistent Post-Concussion Symptoms (PPCS): A Clinician's Workup [2026]
The 5-20% of concussion cases that don't resolve in standard timeframes. Here's the clinical workup framework — vestibulo-ocular, cervical, autonomic, and when to escalate.
Quick answer
Persistent post-concussion symptoms (PPCS) describes the 5-20% of concussion cases where symptoms fail to resolve within the standard timeframe — typically >4 weeks in adults, >2 weeks in children. A PPCS workup must cover four contributing systems:
- Vestibulo-ocular dysfunction — present in ~70% of PPCS cases
- Cervical contribution — present in ~54%, often missed at acute presentation
- Autonomic dysregulation — exercise intolerance, orthostatic symptoms
- Post-traumatic headache + sensitisation — primary or migraine-overlap phenotype
Standard acute concussion training (SCAT6, return-to-play) doesn't cover this. The full clinical workup framework is below — and we've built a forthcoming course around it.
PPCS criteria and timing
The clinical definition is not a single rule. Different consensus statements use different thresholds, but the practical line most clinicians work to:
- Adults: symptoms persisting >4 weeks post-injury
- Children + adolescents: symptoms persisting >2 weeks post-injury (faster threshold reflects faster expected recovery in younger patients)
- Functional impairment — not just the presence of symptoms, but the impact on daily activity, school, work, or sport
Earlier action matters. If recovery has clearly stalled by week 2-3 in an adult, starting the PPCS workup then improves outcomes vs waiting for the formal 4-week threshold. Don't use the timeframe as an excuse to do nothing.
The vestibulo-ocular workup (~70% of PPCS)
Up to 70% of PPCS cases involve unresolved vestibulo-ocular dysfunction. The acute VOMS (Vestibular/Ocular Motor Screening) is your starting point, but PPCS requires going deeper.
Full workup includes:
- VOMS components in detail — smooth pursuits, saccades, near-point convergence (NPC), VOR (horizontal + vertical), visual motion sensitivity. Provoking symptom + objective sign on each.
- Quantified NPC — convergence insufficiency is a common chronic driver; persistent NPC >6cm indicates dysfunction that benefits from targeted treatment.
- BPPV screening — Dix-Hallpike and supine roll test. BPPV after head trauma is common and treatable; missing it leaves a fixable cause active.
- Gaze stability training tolerance — VOR ×1 and ×2 exercises with symptom and performance benchmarks.
See our existing guide: Vestibular/Ocular Motor Screening (VOMS) in Concussion Care.
The cervical workup (~54% of PPCS)
Cervical contribution is the most commonly missed driver in chronic concussion. Mechanism makes it inevitable — any head-impact mechanism is also a cervical-acceleration mechanism. But cervical assessment is rarely done at acute presentation because the head injury dominates clinical attention.
Cervical workup for PPCS:
- Active cervical range of motion — quantified, comparing to expected for age + sex. Pain provocation patterns.
- Cervical flexor endurance test — deep neck flexor strength + endurance commonly reduced after whiplash-type mechanism.
- Cervicogenic dizziness screening — neck torsion test, cervical relocation test. See our dedicated article: Cervicogenic Drivers in Chronic Concussion.
- Joint segmental assessment — upper cervical (C0-C3) is the primary contributor to cervicogenic headache + dizziness; assess passive intervertebral motion.
- Trigger point + soft tissue — sub-occipitals, scalenes, trapezius, sternocleidomastoid.
Autonomic dysregulation + exercise intolerance
A subset of PPCS cases present with exercise intolerance disproportionate to other symptoms — the patient feels OK at rest but symptoms flare with mild aerobic activity. This is autonomic dysregulation, not deconditioning.
Assessment:
- Buffalo Concussion Treadmill Test (BCTT) or equivalent — graded aerobic exercise to symptom threshold, captures heart rate at symptom onset.
- Orthostatic vitals — lying vs standing BP + HR. Persistent orthostatic intolerance points to autonomic involvement.
- Subjective exercise tolerance log — patient-reported activity + symptom diary for 2 weeks.
Treatment is sub-symptom-threshold aerobic exercise prescribed at a heart rate just below symptom provocation. This is the active-rehabilitation approach that replaced the now-obsolete “wait until symptom-free” doctrine: see 2026 Concussion Update — Why “Wait Until Symptom Free” is Obsolete.
Escalation criteria — when to refer
Red flags warranting specialist referral from a primary-care PPCS workup:
- Neurology: new focal neurological signs, progressive cognitive decline, seizure, severe persistent headache unresponsive to first-line management, suspected second-impact syndrome.
- Vestibular specialist / audiology: persistent BPPV-negative vertigo, suspected vestibular hypofunction needing instrumented testing (caloric, vHIT).
- Headache clinic: chronic daily headache, medication overuse headache risk, migraine-overlap phenotype not responding to standard care.
- Neuropsychology: persistent cognitive symptoms (memory, attention, processing speed) impacting function >3 months, return-to-school/work planning support.
- Sports medicine / mTBI clinic: persistent symptoms >3 months not responding to multi-modal management, complex return-to-play decisions.
- Mental health: mood, anxiety, sleep disturbance moving from secondary to primary problem.
Active rehabilitation — the integrated plan
The active-rehabilitation principle (rather than passive symptom-waiting) applies to PPCS too. A typical multi-modal plan:
- Vestibulo-ocular rehab — VOR exercises, gaze stability, NPC training, BPPV repositioning if positive
- Cervical management — manual therapy, deep neck flexor strengthening, segmental mobilisation
- Sub-threshold aerobic exercise — heart-rate-prescribed, progressed weekly
- Headache education + medication review — avoid medication overuse, consider migraine pathways if phenotype fits
- Sleep + cognitive pacing — sleep hygiene, return-to-work/school graded re-exposure
- Psychoeducation — recovery expectations, fear-avoidance counselling
The art is sequencing — not every patient needs everything in week one. Identify the dominant driver, address it, reassess at 2-week intervals.
PPCS Clinical Mastery course — joining the waitlist
We're planning a dedicated course on PPCS — the chronic-case workup in depth, with worked clinical scenarios across vestibulo-ocular, cervical, autonomic, and headache subtypes. Gauging demand first via the waitlist. Members get first access + 50% off launch week if the course goes ahead.
Join the PPCS waitlist (50% off launch)