E3 PreliminaryPreliminaryPEM not requiredLongitudinalPeer-reviewedMachine draft
Post concussion syndrome ebb and flow: longitudinal effects and management.
Rees, Roger J, Bellon, Michelle L · NeuroRehabilitation · 2007
Quick Summary
This study followed 20 adults who had lasting symptoms after a head injury (concussion) for an average of 3.35 years. Participants experienced fatigue, difficulty concentrating, mood changes, and sensitivity to noise. When they received counseling and therapy over two years, some symptoms like irritability improved, but many people still felt fundamentally changed and struggled with feelings of helplessness.
Why It Matters
This study is relevant to ME/CFS patients because it documents the long-term, treatment-resistant nature of post-concussion syndrome and identifies overlaps with CFS and PTSD—helping explain why some patients experience persistent, multi-system symptoms despite standard interventions. Understanding how traumatic brain injury can produce CFS-like presentations informs differential diagnosis and may guide treatment approaches for both conditions.
Observed Findings
- Mean duration of post-concussion symptoms was 3.35 years, exceeding the typical 6-month recovery window.
- Symptoms included physical and cognitive fatigue, depressive behaviors, noise sensitivity, social withdrawal, and concentration difficulties.
- Significant reductions occurred in agitation, irritability, and suicidal ideation between baseline and two-year follow-up with intervention.
- Participants reported persistent feelings of being punished and learned helplessness despite symptom improvement.
- Individuals described themselves as fundamentally changed persons with altered goals, lifestyle, relationships, and employment status.
Inferred Conclusions
- Persistent post-concussion syndrome in some individuals resembles chronic conditions like CFS and PTSD in both symptom profile and psychological sequelae.
- Counseling and psychotherapy can reduce specific symptoms (agitation, irritability) but do not fully resolve the core persistent symptom complex.
- Psychological factors including learned helplessness and identity change are significant components of long-term post-concussion disability.
- A subset of concussion patients represent a treatment-resistant group requiring sustained, multi-modal intervention beyond standard recovery timelines.
Remaining Questions
What This Study Does Not Prove
This study does not prove that post-concussion syndrome causes ME/CFS or vice versa; it only notes similarity in symptom profiles. The lack of a control group and small sample size prevent firm conclusions about the effectiveness of counseling and psychotherapy. The study does not establish causality between trauma and the persistent symptom pattern, nor does it identify biological mechanisms underlying PCS.
Tags
Symptom:Cognitive DysfunctionFatigueSensory Sensitivity
Method Flag:Weak Case DefinitionNo ControlsSmall Sample
Metadata
- PMID
- 17917173
- Review status
- Machine draft
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- Last updated
- 8 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
Spotted an error in this entry? Report it →