Post-Concussion Syndrome
Persistent symptoms following a concussion lasting weeks to months.
TL;DR
Most concussion symptoms resolve within a month, and the biggest modifiable factor is what you do in the first week — brief relative rest then gradual return, not extended darkened-room isolation.
Overview
Post-concussion syndrome describes symptoms persisting beyond the expected recovery window after a mild traumatic brain injury, typically longer than four weeks in adults or two weeks in children. The symptom cluster spans headache, dizziness, fogginess, light and noise sensitivity, irritability, sleep disturbance and difficulty concentrating. Around 80-90% of concussions resolve within two to four weeks, so persistent symptoms are the exception, and their persistence is driven more by non-injury factors than by injury severity: pre-existing migraine, anxiety, sleep disruption, and expectation of poor recovery all predict prolonged symptoms better than the mechanism of impact. Management guidance has reversed in the last decade. Prolonged complete rest was standard and is now understood to worsen outcomes; the Concussion in Sport Group consensus recommends 24-48 hours of relative rest followed by graded reintroduction of light aerobic activity below symptom threshold. Sub-symptom threshold exercise, guided by a Buffalo treadmill test, has randomised evidence for faster recovery. Cervical spine and vestibular contributions are frequently missed and are treatable with targeted physiotherapy. Headache should be assessed for medication overuse, which develops readily in this population. Supplement evidence is preliminary: omega-3 has substantial animal data and thin human trials, creatine has small paediatric data, and magnesium has mechanistic rationale without confirmation.
Common Symptoms
- •Persistent headache
- •Dizziness or unsteadiness
- •Mental fogginess and slowed thinking
- •Light and noise sensitivity
- •Irritability and mood change
- •Sleep disturbance
- •Fatigue with cognitive effort
Common Causes
- •Mild traumatic brain injury
- •Cervical spine injury
- •Vestibular dysfunction
- •Pre-existing migraine
- •Anxiety and mood disorder
- •Sleep disruption
- •Medication overuse headache
Root Causes
Diffuse axonal stretch injury with transient neurometabolic cascade, cerebral blood flow autoregulation dysfunction, concurrent cervical spine and vestibular injury, sleep disruption amplifying symptoms, pre-existing migraine or anxiety, and expectation and activity avoidance prolonging recovery.
How It's Diagnosed
Diagnostic Markers
- Clinical assessment with SCAT or similar tools
- Post-Concussion Symptom Scale
- Buffalo Concussion Treadmill Test
- Vestibular-ocular motor screening
- Cervical spine examination
- Imaging only where red flags are present
When to See a Doctor
Seek emergency care for worsening headache, repeated vomiting, seizures, increasing drowsiness, unequal pupils, weakness or slurred speech after a head injury. See a doctor for symptoms persisting beyond two to four weeks, or any return of symptoms after apparent recovery.
Supplements Studied For This
Omega-3 Fatty Acids
Strong animal data for axonal protection after brain injury, but human trials are small and have not yet shown symptom benefit.
Creatine Monohydrate
Small paediatric work suggested benefit for post-traumatic symptoms, but the evidence base has not been replicated in adults.
Diet & Lifestyle
Suggested Pattern
No dietary pattern is established for recovery. Adequate hydration, regular meals and limiting alcohol support symptom management, and alcohol in particular worsens cognitive symptoms during recovery.
Supporting Research
Nutritional Supplement and Dietary Interventions as a Prophylaxis or Treatment of Sub-Concussive Repetitive Head Impact and Mild Traumatic Brain Injury: A Systematic Review
Prevention of traumatic headache, dizziness and fatigue with creatine administration. A pilot study
Amelioration of acute sequelae of blast induced mild traumatic brain injury by N-acetyl cysteine: a double-blind, placebo controlled study
Magnesium for acute traumatic brain injury
Sleep Problems and Melatonin Prescription After Concussion Among Youth Athletes
Frequently Asked Questions
What is post-concussion syndrome?
Should I rest completely after a concussion?
Do any supplements help concussion recovery?
When should I go to hospital after a head injury?
Can I exercise with post-concussion syndrome?
How long does post-concussion syndrome last?
Who It Affects
Around 10-20% of people with concussion have symptoms persisting beyond a month, with higher rates in those with pre-existing migraine or anxiety.
Quick Facts
- •80-90% of concussions resolve within four weeks
- •Prolonged complete rest worsens rather than speeds recovery
- •Sub-symptom threshold aerobic exercise has randomised support
- •Cervical and vestibular contributions are commonly missed and treatable
Lifestyle Tips
- •Rest relatively for 24-48 hours, then begin light activity — do not isolate in a dark room
- •Exercise below your symptom threshold rather than avoiding exertion entirely
- •Prioritise sleep regularity, which strongly influences symptom burden
- •Limit painkiller use to avoid medication overuse headache
- •Ask for vestibular and cervical assessment if dizziness or neck pain persists
- •Return to activity gradually and stepwise, not all at once
My Notes
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.